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Re: Speedometer Removal
Posted by Wilson Matt (more from Wilson Matt) on Mon, 13 Mar 2000 08:39:37
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

Actually, after removing the instrument cluster, you are about 90% there.
Lie the cluster face-down on a towel, with the back facing you. Since the
Speedo is in the middle, you must carefully remove the Tach and Fuel/Temp
gauges first. You will see screws holding these gauges in, remove them. The
gauges themselves will be connected by the flexible circuit board, be
careful not to tear this. Lift the two side gauges out as a pair, again
being careful not to kink the circuit board that joins them. Now you can
remove the Speedo. Takes about 3 min. to do.

Once you get the Speedo out, you can remove it's cover by removing all the
screws on the back. (You don't need to pull off the needle.) I replaced the
Speedo in my 84 with one from a parts car. I also had good luck in
'dialing' up the correct mileage by carefully sliding the pin that holds
the connecting gears in place a bit, and this allowed just enough room for
the gear to spin freely. It took a little while, but I managed to 'add' a
few thousand miles to the working Speedo/Odo so it matched the 179K of the
one when it died. I seem to remember that it wouldn't allow you to go
backwards, though, for obvious reasons :-)

The gear assembly is very delicate, so be careful or you may end up with
another non-working Odo. :)

I used a power drill to test it before I put the Speedo back in the car,
make sure you let it roll over a few miles first.

One thing I have noticed, with both Saab speedos, is that when you reset
the trip meter, the 3 mileage digits would always reset to zero, but the
tenths digit would sometimes stop between a number. When this happened, the
Odo would not stop working completely. You may think, 'crap, my odo is now
broken,' but if you push the trip meter in a few times again to get tenths
digit to read full on zero (or some other number, actually), the odo would
work correctly again.. Note: I always waited until the car was stopped to
reset the trip meter..

Matt W.

90 900TC
84 900S
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