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I have 1979 el camino and i just bought and aftermarket bosch tachometer and got it s et up except for the light, No shift light, just the normal gauge light. It says i have to splice it into a wire connected to a light switch or dimmer switch or something... What wire do i splice into to get my tach to work with the normal gauge lights, and where it located? Im not good at wiring so anything helps, thank you.
 

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the other lights are on a printed board, can't splice into that. The knob on the lower left side switches these on and off, find which wire sends power when you pull the knob out, also when you twist the knob, the lights should dim...
 

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I just ran a wire to the Ing on my fuse box, light comes on when the car is running, Day or Night
 

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