1976 corvette

The tach was not working and stuck around 1200 rpm. I changed the circuit board. While running, needle steady at 750 rpm at iidle and works properly when car is accelerated. When I turn car off needle sticks at approx. 300 rpm. If I tap tach, it slowly returns to zero. There is plenty of space between needle and face.If I turn the key switch on, without starting, the needle backs up about an inch below zero.
Any help would be appreciated

Frankie d

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