Dave:
If the needle is sticking as Mark L. says and continues
to stick, you can clean it yourself.
On my twin cam, the extra coils for the temp gauge are
under the dash. If so, undo the coils and slide the
gauge out of the dash. At this point, it might be
difficult to do the following as I removed the complete
unit.
1) Remove the bezel and glass. The bezel is intended
to be removed by twisting it about 10 degrees aligning
the tabs on the bezel with the notches on the housing.
2) You can take a chance and clean the unit with the
dial on, but I removed the dial and hands.
3) The hand is a press fit on the shaft and may not
come off very easily.
4) Remove the screws holding the gear train in the
housing and slide the housing down the tube.
5) Clean the gear train in naphtha, or ammonia. Dry as
fast as possible to keep any steel from rusting. I
used a hair dryer with the ammonia. Naphtha is
combustible so be careful.
6) Replace gauge into the housing and replace the
face. The gear train shouldn't really need any
lubrication except on the shaft bearings. Used very
light weight reel and gun (bad word here, don't read).
Use the eye of a needle to apply the oil. You want a
minuscule amount. The gear teeth shouldn't need any as
this is the recommendation I found in a book on clocks.
6) Place the temperature bulb in hot water with an
accurate thermometer.
7) When the water temperature reads 180, put the needle
back on so it reads 180.
8) The gauge will also now be accurate at engine
temperature.
Blake
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