|This is not a project for the timid. You're here for
one of two reasons. Either you have to fix your gauges or you have decided to change the
color of the faces of the gauges.
I took on the project because I wanted to accent the
almost totally black dash with white gauge faces to pick up the white on the exterior of
the car. I had no idea that the change would be so dramatic! At first, the gauges seemed
huge because there is so much white in a small space, but the do seem a lot more visible
and pleasing to the eye. All in all, a very worthwhile and rewarding project.
The time I spent on this project was actually not that long. All totaled--two
evenings. My biggest problem was that I ordered my gauge face kit (these are the glue on
type) one day and took all of the gauges out that night thinking the faces would arrive
the next day or two--and they did!
I went through the "can opener" ordeal to get the bezels off and then
realized the faces were for a 75-79 911--not a 74. The oil temp/pressure face is
different for just the 74 where there is an Alternator light at the top of the gauge and
the speedo has 6 windows instead of 5. Now, I was in trouble. I could not get faces for a
74 because (apparently) they are not very popular and I had a Porsche club tour coming up
in two days. I had to put everything back together and wait almost two weeks to get the
So, two weeks (and a new Momo steering wheel) later, I am ready to do it again.
Two VERY important tips. One, TAKE PICTURES of the backs of the gauges. It will be a
lifesaver for you in the end. Two, double up on your chances of getting it all back
together right and use wire ties to keep wires together that go to a common area of a
gauge AND use different colors of paint to mark the connector AND the wires that go into
them. You will not regret this piece of advise later ! Clean all the connectors &
change the bulbs while your at it too.
OK, here we go.
Before and After
The photos above show the difference in the look of the interior of the car before and
after the gauge face replacement. The gauges appear much larger than before and are easier
to read as well.
As you remove the gauges from the dashboard I recommend you take some pix of the
backsides so that you will have something to refer back to when you put everything back
together. I had to pull out copies of digital pix that I took in order to get all of the
wiring back into the oil gauge. Figure 10 shows how to disconnect the manual odometer
reset that is connected to the speedometer.
Figure 11 As an additional safety measure I used wire ties on groups of
wires and painted the connector and the wire attached to it a different color from the
others on the same gauge.
What a nightmare! Actually if you take the pix, mark the wires and connection
you'll actually feel pretty calm looking at this. And just keep repeating I can put
it back together, I can put it back together.
Opening Up the Gauges
I recommend that you only work with one gauge at a time so that you don't get
pieces mixed up and if you get interrupted (that never happens!) you'll know where
Figure 13 The first thing you will do is remove the rubber mounting ring
from the gauge.
Figure 14 Using a screwdriver, slip the blade between the housing and the
edge of the crimped over gauge bezel. Go completely around the gauge prying the bezel out
until it is even with the edge of the gauge housing.
Figure 15 Now pry (carefully!) the bezel away from the edge of the
housing. You will have to go around the gauge to get it to come off.
Figure 16 The bezel will now come off of the gauge. There are 3 pieces,
the outer bezel, inner bezel and the glass. This is a good time to clean the glass on your
Figure 17 After you clean the glass with a lint free cloth, put it to the
side along with the other parts while you work on the face.
Figure 18 After removing the bezel, you will need to take the hands off
of the clock face. The tool that comes with the face kit was too large to get under the
hands of the clock, so I used a small screwdriver bent 90 degrees on the end to provide
leverage. BE CAREFUL!! You will hear me say this again, but it is so true. A GENTLE touch
is required. No coffee during this operation. If you meet any real stiff resistance -
STOP. Find out why it is not moving and try going around the base of the pointers to free
Figure 19 You'll be seating about now. This is really easy when you
get past the fear of screwing it up. If you do, you send it off to the place that was
going to charge you a bundle to do it for you. Nothing ventured--nothing gained. Now
that you have the face off you just glue the new white one on and let it sit for a few
minutes. I recommend you use epoxy glue. Tape will not hold for long in the heat.
Figure 20 Reassemble the hands--CAREFULLY! Sit back for a moment
and admire your handiwork. Or if you broke something, have a good cry and a beer while
looking up the number of that gauge place.
Figure 21 Wow, looks just like they do it in the big city! One down - 4
Oil Pressure/Temp Gauge
Figure 22 Disassemble the gauge as you did with the clock (getting easier
with each one), remove the face and glue the new white face on it. Set it to the side. You
will now have to remove the individual temp and pressure gauges from the housing. On the
back of the gauge, take out the small screws that hold each of them in.
Figure 23 After you pull the unit out if the housing just apply epoxy to
the back of the white face and slide it over the old face making sure to get it lined up
properly before the glue takes a set.
Figure 24 Here's the before and after in the same gauge.
Figure 25 Now do the same to the other side and reassembly the unit.
Figure 26 Wow, Now you should be getting pretty good at this. By the way--start this early in the evening because once you get going you really don't want to stop. I was up until 4 AM because I wanted to finish--and no it wasn't a weekend! OUCH!
Fuel and Oil Level Gauge
Figure 27 OK, by now you know the drill. This gauge is the same as the
oil gauge with the gauges mounted from the back of the housing. Take it apart, pull the
face off, glue on the new one and remove the individual gauges.
Figure 28 As with the oil unit, glue the faces on and reassemble. It
really does go fast at this point.
Figure 29 The white really does look sharp against the black bezels.
Figure 30 The Speedo is a little different from the others. You need to
pay attention to where the needle is set in order to reassemble it correctly.
Figure 31 The needle rests against the stop attached to the face of the
gauge. Lift the tip of the needle up CAREFULLY!!! and move it over the peg.
Figure 32 Let the needle come to a rest and you will see it point to one
of a number of lines marked on the lower part of the gauge. MARK THIS POINT ON THE EDGE OF
THE GAUGE HOUSING. You will need to set the pointer back to this mark when you reassemble
Figure 33 Using the tool provided (or you can use a fork as I did some of
the time) GENTLY pry up the pointer and remove it from the stem.
Figure 34 Remove the two (very) small screws from the face of the speedo.
Figure 35 Pull the face off, apply the epoxy and glue the new face on.
Figure 36 Reassemble the unit and if you were listening you should be
able to see the mark you left on the housing to index your pointer as you put it back on
the stem. Push it on GENTLY!
Figure 37 The tach is just like the speedo. Be sure to note where the
Figure 38 When you take the face off take this opportunity to clean out
the gauge and change out the bulbs.
Figure 39 Glue the new face on making sure all of the holes line up
Figure 40 Reassemble it into the housing.
Figure 41 Attach the needle CAREFULLY.
Figure 42 Install the glass and outer bezel.
Figure 43 You are done! Now go to bed! When reinstalling the gauges just
match up the color-coding you did on the connectors and the housings. It will go faster
than you thought.