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So the gauges work when the lights are off?
If so then things are being ground through the light switch.
When you turn on the lights and you now have power going through the switch,causing a short in the system.
Check for the small ground wire that attaches to the dash frame.It's there to ground out the gauge console.
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension.
Petrolia,Ontario,Canada but working in Port Huron,MI.
See ALL my Blazer pic's HERE
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