Hi Bill:
I would recommend that you read Stu Brennan's article in the Tech Tips
section of Tigers United at
http://www.tigersunited.com/techtips/BrennanGauge/rt-BrennanGauge1.asp
Stu does an excellent
job of explaining how the Tiger gauges work and gives some good advice
on checking them out.
The temp and fuel gauges work by varying their resistance, as Stu
points out. A higher resistance
yields a lower reading on the gauge. If your gauge is reading high,
it may be because it is out of
calibration. One way of correcting this, that I have used, is to add
some extra resistance in series
with the gauge. In my case, I had an extra variable resistor laying
around which I placed in series
with the gauge and adjusted until I got the correct reading. As you
already have an IR thermometer,
you can use it to read the temp when the thermostat opens and then
adjust the variable resistor
(sometimes called a potentiometer or "pot" for short) until the gauge
reads the same as the IR
thermometer. Then take a multimeter and read the resistance of the
pot. Go to your local
Radio Shack and buy a fixed resistor with a value as close as possible
to your resistance
reading on the meter and replace the pot with the fixed resistor. A
resistor with a power rating
of 5 watts or more would probably be the right size.
There are other possible reasons why the gauge is reading high, like a
bad ground (the cause of about
90% of all electrical problems in Lucas systems, IMHO), a bad voltage
stabilizer or a bad sender which
all should be checked out as well. If, however, the gauge turns out
to be out of calibration, you can
send it out to have it repaired or you can use the cheap solution
outlined above.
Cheers,
Tod
B382002384LRXFE
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