Temp gauge

by Dwight
(Macomb Michigan)

Hello I have a 1973 350 that someone added a temp gauge that brings antifreeze to the gauge. I am changing it back to the original set up. My problem is I have three wires on the old gauge and there is no longer a wire in the engine compartment. Does anyone know what color gets hooked up to the gauge on the new sensor. The old sensor has a Blue, light blue and black wire.

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