Those old analog meters have 2 very tiny flat wound copper springs in them. As the meter ages ( from use or from lack of use, car sitting, does not matter) those springs weaken. Those are soldered in-place and that is not something that you could repair. Those 2nd Gen trans am tachometers have a "forced" zero position which is not like any previous GM car tachometer design. They can do that when the springs are brand new, the springs are what give the meter it's zero position at that counterclockwise angle.
All 1970 up to I think 1977 or 1978 trans am tachometers which were built with the old analog style meter do that.
At this point the only cure for that is to replace the tachometer.
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Peter Serio
Owner, Precision Pontiac
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