From: Paul Gilbert
>I'll bring home a hot plate and a beaker and immerse the sensor in
>boiling water to get a 212 F point. Is there a way to adjust the
output
>from the gauge. I just put in a three core radiator and had a
>thermowell brazed into the bottom of the radiator just below the bottom
>hose connection. The lowest temp. switch that I could find makes at
198
>F. This switches a pusher fan. I think I will try to run the car with
>a 10 psig cap around 210-220. I would like to adjust the gauge to go
>into the red at 220. Is this possible?? How??
Paul,
Verify all the connections are correct on the gauge, also, if the sender
is
now mounted to the radiator, be certain that the radiator is well
grounded,
as the sensors return path is supposed to be through the engine block,
and painted radiators may have a marginal or non-existant return.
Ground aside, it sounds like your sender is acting like a swtich instead
of the thermal restistor it ought to be.
Be certain that the sensor is good prior to proceeding with
tweaking the readings.
Does anyone have the room temp resistance and boiling point
resistance on the sender?
In answering your question on ajusting the reading, it is possible
to adjust the offset and scaler factors of the gauge by puting
resistance in line with the sensor, and or shunting resistance across
the sender. Conversly, it is also possible to do the exact opposite
offset and scaler gauge effects by puting inserting resistance inline
the gauges "hot" line, and shunting resistance across the gauge.
In this way, you should be able to tweek any minor reading annomily
by installing appropriate series and or shunt resistors on the gauge/
sender.
I have calibrated gas tanks in this manner without pulling the sender.
I'd have to put more thought into what to do, and where for a given
required adjustment.
Cheers,
Jarrid Gross
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