Well today I finally fixed it right.
Got my 500 power glasses on,and saw where,everytime I screw amp on base.The wire coming up from sender on crank,slips down.Not making contact with amp.Solution was to hold sender wire firmly in socket.While screwing Tach Amp back on.Then cut rubber to put under base to pervent wire from ever slipping again.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt