Mine has had this problem for two years. ASG has not found the source which is likely a short somewhere. The tach has been sent out for refurb and still it does it. Only when hitting bumps. Hit another bump and it operates normally. Some rainy day I could trace the wiring I suppose.
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Brian
02 Carrera Seal Grey
16 Mazda6 GT
14 Mazda3
76 Lincoln Mark IV
94 F150 XLT
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