Just installed a Holley Terminator in a customer's car. Running a Holley Dual Sync Distributor, MSD 6A. The handheld screen has the RPM at 920-940, but the Tachometer in the car reads around 1200-1400. Anything that can be done to bring the car tachometer to read the same as the handheld? Maybe some kind of resistor. Thanks, Max.