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My tach needle resets to zero when the ignition is turned on. However, when you put either turn signal on, or mess with the headlight switch, the needle starts jumping all over the place. I can't figure it out.
Also when you stop playing with the signal or headlight switch, the needle sometimes stops at about 1000 rpm, and to get it to go back down to zero you need to turn the ignition off and on again. Any ideas on what the problem may be?