BWebb

The Tach on my 1987 Pachanga is reading around 1000 RPM's higher than the engine is actually running. When the motor is off it returns back to 1100 RPM's. I have tested the engine with a RPM meter to confirm my findings. Is there a calibration adjustment on Tach's or do I just need to look for new instruments. If I need a new Tach/instruments please provide recommendations.

cloudmaster_321

i have found on my tach, that there is an adjustment on the back. It uses something similiar to a wand used in radio repairs. I just took a metal coat hangar and filed it down to a straight edge, basically you just need a very small screwdriver, don't know about your tack, but both my original, and my aftermarket tachs had an adjustment pot on the back.

Gary Anderson

The adjustment on the back is usually a selector for 4, 6, or 8 cylinder engine. Check your ignition secondary for loose/cracked wires, cap etc, that can cause high readings. If that's not the problem, buy a new tach.
Gary

cloudmaster_321

that is one of the adjustments, but there is a calibration adjustment also