780 V6-2849cc 2.8L SOHC B280F (1987)
4. Adjusting:
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Turn off ignition and disconnect battery negative lead.
Adjust the potentiometer. It should show max. resistance of 33 ohms initially.
Reduce resistance by turning clockwise.
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Check reading as per step 3.
5. Locking potentiometer:
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Remove battery negative lead.
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Lock potentiometer by placing a drop of varnish on it. Use a touch-up brush.
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Wind Insulating tape around the potentiometer so it is protected against shorting.
6. Remove resistor:
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Remove connector and resistor from gauge connector in trunk.
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Plug in connector between gauge and sensor again.
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Reconnect battery.
The connector with resistor can be retained for use on other cars with the same fault.