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Pelican Technical Article:

Speedometer Removal

Time:

30 min

Tab:

$150

Talent:

*

Applicable Models:

 
Porsche 911 (1965-89)
Porsche 912 (1965-69)
Porsche 914 (1970-76)
Porsche 930 Turbo (1976-89)

Parts Required:

New speedometer

Hot Tip:

Make sure you mark where all the wires go before you disconnect them.

Performance Gain:

Better reading of actual speed

Complementary Modification:

Upgrade to 150 MPH speedometer
101 Projects for Your Porsche 911

This article is one in a series that have been released in conjunction with Wayne's book, 101 Projects for Your Porsche 911. The book contains 240 pages of full color projects detailing everything from performance mods to changing your brake pads. With more than 650+ full-color glossy photos accompanying extensive step-by-step procedures, this book is required reading in any Porsche 911 owner's collection. See The Official Book Website for more details.

In the early 1980s, the United States mandated that all cars sold would have their speedometers limited to 85 MPH. While fine for the standard Buick or Toyota, this limitation is somewhat of a pain for Porsche owners. The good news is that this law was changed a few years later, and Porsches were again equipped with a speedometer that could more accurately reflect their performance.

More good news exists for cars equipped with the paltry 85 MPH speedometer. The speedometer can be replaced with either an earlier or later model unit with the higher speed markings. In the same manner, a MPH speedometer can be replaced with a KPH speedometer.

The first step is to find yourself the proper speedometer. There have been different faces and different type styles used on a few of the 911 speedometers, so you should probably take a look at one you are buying very carefully to make sure that it matches the rest of your gauges. Also, the gauges manufactured by VDO for Porsche have a less than desirable life for the odometer (See Pelican Technical Article: Odometer Repair, Odometer Repair), so make sure that any used gauge you purchase is fully tested and working. Otherwise you may have to pay an additional $100 or so to have the gauge repaired.

Replacing the speedometer couldn't be easier. Like the rest of the gauges, the speedometer is held into the dash with a rubber seal. You should be able to grab onto the speedometer and pull it out from the dash. Gently pry on the rim of the speedometer with a stiff putty knife if it doesn't want to come out easily. Work carefully so that you don't ding anything. You can also reach around underneath the dashboard and push it out from behind. Be aware of the wires that are attached to the rear of the unit as you are pulling on it.

Replacement is easy: simply remove the wires from the old one, and plug in the new one. Make sure that you make a note of which wire goes where, as it is easy to get confused, and the speedometers are not well marked. Also make sure that you don't damage any of the small light bulbs or their fixtures when removing them from the rear of the gauge. An additional concern is the glass or plastic face of the gauge. It's easy to scratch it if you leave it hanging near the steering wheel column.

On the very early cars, the gauges were held in using two small clamps behind the gauge. In order to remove the speedometer, you need to remove the two clamps and pull out the gauge. On cars equipped with cable-driven speedometers, you need to unscrew the cable from the back of the unit before you remove it from the dash.

Getting your speedometer out of the dash is the first step in a few projects. Once you have the speedometer out, you can send it in for recalibration, have the odometer repaired, or simply have it cleaned and a new faceplate installed.

The speedometer is held into the dash using a rubber seal.
Figure 1

The speedometer is held into the dash using a rubber seal. Pulling on the outside of the speedometer should remove it from the dashboard. Make sure that you disconnect the speedometer cable if the unit isn't electronic. Some of the wires attached to the rear of the unit may not be too long, so be careful when pulling on them.

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Comments and Suggestions:
Tim Comments: Her is the best one I have. I have tried to pull them out and they won't budge. They are spring loaded....
November 16, 2016
  Followup from the Pelican Staff: The small metal lip surrounding the plastic collar is likely stuck. Try gently levering on the lip with a small flathead screwdriver. - Nick at Pelican Parts  
Tim Comments: I can't get the "light" wires off my 89 911 speedo. Does anyone know how to get the wires off the speedo?
November 15, 2016
  Followup from the Pelican Staff: Should pop out when pulled. Can you share a photo so I can confirm?- Nick at Pelican Parts  
Wheelnut Comments: I have a 1993 964 that I keep on a trickle charger. Some say this is a bad idea. Now my speedometer needle jumps and the rear tail raises and lowers with registered speeds at 50mph. Did the trickle charger cause this, and now what could be the problem? Thanks!
June 18, 2016
  Followup from the Pelican Staff: I would assume it did not cause it.

The issue may be due to a fault speed sensor. - Nick at Pelican Parts
 
rriveralebron Comments: Can you please help me to identify which means the top and bottom red light... and what means the top one when blinks all time?
May 2, 2016
  Followup from the Pelican Staff: brake system indicator (B)

alternator warning light symbol (G) - Nick at Pelican Parts
 
Wyvern Comments: Great info here , Working on my 73 914 ... how do I disconnect the speedo odo reset cable so that I can then remove the gauge
March 23, 2016
  Followup from the Pelican Staff: The cable has a metal collar, it unscrews from the back of the gauge. - Nick at Pelican Parts  
Danno1 Comments: where is the conection on the tranny for the speedo cable on a 1971 911t. is it on the drivers side or passenger side of the tranny?
February 20, 2016
  Followup from the Pelican Staff: Should be on the center, above the mount on the top of the trans. - Nick at Pelican Parts  
Danno Comments: HI All... first time user
My speedo and odometer are not working. It was acting up for the longest time and stopped completely.
Could it be a bad fuse that is effecting the speedo?
Were is the fuse location in the fuse box that might be the challenge effecting the speedo or does it just work
of the speedo cable ?? Can you tell me where the speedo cable connects at the other end???
Does the speedo unit have the clips in the back for removal or is this one that just pulls out??
Thx in advance.
Cheers
December 26, 2015
  Followup from the Pelican Staff: I would assume it is the speedo head or cable. Remove the speedometer, then check if the cable is OK, when the vehicle stationary it should rotate. if it looks OK, try rotating the speedo drive, does the speedo work?- Nick at Pelican Parts  
Drew_SC Comments: I'm attempting to fix my speedometer 911SC-1979 and I have it removed from the dash but can not seem to remove the wires with the orange bases. Any thoughts on removing those wires. Thank you.
November 23, 2015
  Followup from the Pelican Staff: Try rotating the orange connector 45° while pulling it out.- Nick at Pelican Parts  
James r long Comments: 69 911t targa How do you get to the brackets that hold the gages in. There is no room under the dash to get to them?
November 11, 2015
  Followup from the Pelican Staff: it's a tight fit from what I remember. Someone in our community may have a tip for you. I opened a post in our forums. A Pelican community member may be able to answer your question.
- Nick at Pelican Parts
 
John Porter jp69911e Comments: I have a 1969 911e with mfi. I recently noticed that my odometer is not working, but the speedometer is. Where might the problem be-in dashboard or back with the transmission?
September 10, 2015
  Followup from the Pelican Staff: If the speedo is working, but not the odometer. the problem is in the odometer. See this tech article

http://www.pelicanparts.com/techarticles/101_Projects_Porsche_911/89-Odometer_Repair/89-Odometer_Repair.htm

. - Nick at Pelican Parts
 
Steve Comments: I need to replace the bulb for the low beam headlight indicator on the speedometer of my 1977 911 targa. Can you tell me which bulb to buy.
July 21, 2015
  Followup from the Pelican Staff:
I’m not the best with part numbers.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Bgp38 Comments: Do u know if an '87 930 speedometer will work in an '82 SC?
Thanks
July 8, 2015
  Followup from the Pelican Staff: I am not sure.

I opened a post in our forums. A Pelican community member may be able to answer your question.
- Nick at Pelican Parts
 
Tim Comments: I made a mistake and didn't mark what wires go where on my 1980 911 Targa. Can you help me with a wire diagram
April 13, 2015
  Followup from the Pelican Staff: I don't have the wiring for that vehicle.

I opened a post in our forums. A Pelican community member may be able to answer your question.
- Nick at Pelican Parts
 
SC_Mike Comments: Thanks Nick! I guess I will use a bit more grunt - and try not to damage anything
September 18, 2014
  Followup from the Pelican Staff: Of course, work gently. ;)

Let me know how you make out.- Nick at Pelican Parts
 
SC_Mike Comments: Getting the Speedo, Combo, Clock gauges out is easy, but what about the Tach? I've been looking at pulling it out for years and it seems that the steering column cover and the leather dash lower lip are in the way, or it my Imagination? Anyone had Trouble with this? Thanks for help!
September 17, 2014
  Followup from the Pelican Staff: I'm going by memory, but I recall removing the steering column cover, then levering the tach out with a plastic prying tool. - Nick at Pelican Parts  
Rangiegaz Comments: My speedo in my 82 930 is working intermittently ,by that, I mean jumping and then going back to zero. Sounds like loose connection, but checked back of speedo and all appears fine .Are there any other joins which could have come apart ?
April 29, 2014
  Followup from the Pelican Staff: You could have an erratic signal or ground. More likely is a faulty speedo. - Nick at Pelican Parts  
Howard Comments: 1976 911S speedometer wiring. Three terminals +, - and sensor. Do you know the color code? The ground is obvious and has two wires on the lug. The red wire has 12 volts on it when the ignition is turned on. Does the sensor lug have two wires on it?
December 17, 2013
  Followup from the Pelican Staff: Check this forum topic. It should be helpful:

http://forums.pelicanparts.com/porsche-911-technical-forum/520645-wiring-all-gauges-911-sc-2.html - Nick at Pelican Parts
 
cooldaddysquid Comments: Sorry! '84 911.
September 4, 2013
  Followup from the Pelican Staff: My wiring diagram shows unfused power coming from fuse boz 1 on a red/black wire (no pin number). There is also an ignition feed from the ignition switch, red/black wire on pin 2. - Nick at Pelican Parts  
cooldaddysquid Comments: What is the fuse location of the speedometer?

Thanks!
September 3, 2013
  Followup from the Pelican Staff: I would have to know the year and model of your vehicle to be sure. - Nick at Pelican Parts  
Jerry Comments: Thanks Nick, do you know where i can get one of those bulbs, one is missing?
jerry Harwood
August 28, 2013
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can help you find the bulb. - Nick at Pelican Parts  
jerry Comments: How do I get the wires out of the three red sockets?
Porsche 911-1984
August 27, 2013
  Followup from the Pelican Staff: If I remember correctly there are three, those are the bulbs and they oull straight out of the speedo. - Nick at Pelican Parts  

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