I have run the a new wire to the sender from the back of the plug that goes in in that picture. The signal wire I used was the left most wire. I used this because when I eathed it out the gauge went to hot instantly.
Lexsmaz the gauge goes to hot as soon as the ignition is turned to on even if the car is stone cold. And yes as soon as the sender wire is disconnected it drops straight to cold.
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