turn on the key to run but don't start the car and look at the voltage it is normal when the car isn't running then it is the guage if it only does it when the car is running then it's the alternator's regulator went out.
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'89 GT
K&N, Twisted Wedge heads, TFS intake,FMS 1.7 rockers, Trick Flow stage 1 cam(221*/225* .530in\.542in) , 3.73's, headers, off road H-pipe, Flowmasters, FMS Clutch, Tremec, PRO-5.0, FMS driveshaft, fluidyne alum. radiator, and more to come.
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