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Ihave a 1959 Corvette... All the numbers match.. However when I got the car someone put in a Mallory uilite dist.
When the engine is at 2000 RPM's, the tack is reading 4000 RPM'S...
Can someone tell what I need to do to fix this?
Unless your car was originally a fuelie, the tach was driven off the generator. It turns at engine speed, while the distributor turns at half engine speed. Suspect you have a wrong combination of parts. The tachs are calibrated differently for each application. A speedometer repair shop can probably recalibrate your mechanical tach.
It could be something as simple as someone has put a very small generator drive V-belt pulley on. The correct pulley has a 3 1/2" to 4" diameter. Take a look.
Brad
Or, it was originally a fuelie (distributor-driven tach) and is no longer, and now has an engine-speed generator driving the original half-speed tach head, so it reads double engine rpm. Or, someone changed the tach and installed the wrong one and didn't want to go through the exercise of changing it a second time. Bubba is everywhere
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