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Expert electrical advice needed for temp gauge! 200

This is an old message and an old response I need more help please...

Hello,
I jumped the temperature comp board and my gauge still only moves up to about 1/4 the way up. Is it the gauge? How do you test it? Thanks for your help!

bsallen wrote in response
Find the wire at the sensor (yellow? I think). Sensor is under the intake manifold. Ground the wire, gauge should read full scale.


Current-
I grounded the wire, and the gauge needle dropped like the power was off. What is going on?
--
1990 240- 240K- VX cam, springs, bilstiens, spt exh, euro lamps-turbo whls,Near Houston






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