Tach reading 1000-1500rpm to high??

Well, a friend of mine was just saying his hi dolla autometer tach was doing the same thing,his turned out to be that the needle had spun on the shaft,probably wierd,I thought,but it did sound like your condition,his had been (shift point) set too high and was bouncing off the stop,when the ignition was turned on,like I said,fancy race tach in a street car.