I have the 1979 SS gauge package. I have 12 volts to the tach and a signal from the distributor. The tach goes to 0 when key is on. I also have a clock in the tach and the second hand works but the minute and hour hands do not move. Where can I send this to be repaired. Or some tips to check it. I have been an electrical contractor for 35 years and can use an ohm meter.