to start...disconnect the new gauge and see if your problem goes away. The alternator can be checked with a volt meter at the battery. CK the voltage at the battery before starting the car then after starting it to see if the alternator is good or not. The voltage should go up after starting the car to about 14 volts from about 12 volts at the battery with the car off.
Tazz
Rat Rods Rule!
Tazz
Rat Rods Rule!