ACC or IGN for power and volt gauge. Depends on if you want the gauges on while in accessory mode or only with ignition on. They will draw some power, not a lot but some, so if left on in accessory mode for a long time, like listening to radio, they will add more drain on battery. Normally gauges only have power on while engine is running, IGN. Should be able to tap into dash light power for the lights.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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