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Old 04-23-2021, 07:57 PM   #16
hiperfauto
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Join Date: Nov 2011
Location: So Cal
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Other than the manufacturer (VDO or Yazaki) and the face plate the temp gauges are functionally the same from '73 to '93. There is no different gauge for diesel.

If you grounded the sender wire and let the gauge peg you may have damaged it. You're supposed to connect a resistor to test the gauge.

Testing procedure per the greenbook.

Quote:
Testing temperature gauge
lf the temperature gauge is faulty, the faulty component
(sensor, indicating instrument or voltage regulator)
must first be traced and then the fault
remedied. ln order to trace the faulty component,
two or possibly three resistors are required, one or
two at 40 ohms and one at 282 ohms.

Trouble shoot as follows:
First disconnect the electric cable from the temperature
sensor and then connect up the 282 ohm
resistor between cable and ground.
With the ignition switched on, the pointer on the
indicating instrument should be at the beginning of
the green field (=122F). Instead of the 282 ohm
resistor, then connect the 40 ohm resistor. The
pointer on the indicating instrument should be at the
beginning of the red field (2480F). With correct
indicating instrument function, the sensor is defective
and should be replaced
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