as far as the tach, there will be 3 connection. one is a ground, other is a power supply only when the key is turned on, and the third goes to neg side of coil (should be a brown wire). this wire going to coil had a small in-line fuse from factory. with the temp/oil guage, you will have to change the sensors in the engine. they are different sensors for idiot lights and guages.
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73 Grand Am 455 Muncie M20 4 speed 3.23 gears
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