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Hi, I just recently bought my first pickup truck, suppose to be just an ugly and tough work horse.
It's a 1990 GMC sierra 2500 4x4, the cluster seems to work normally until I turn on the headlight switch, then all the gauges drop except one, it goes all the way over, the LR signal indicators stay on, and depending on how I play with the dimming wheel, the check engine light and check gauges light goes on or off. (and the gauges don't light up at all)
It has a ground from battery to engine, battery to body, and body to chassis.
I'm not very good with electrical issue so any guidance will be very appreciated. Thanks.
 
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