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Re: Tachometer Filter For HEI ?
Hi Terry the issue I have is the two tachometers I have tried only have two wire connections. Black - and Red +. These are diagnostic meter for tune up purposes. For a tachometer to work with a HEI you must have three wires - negative, + to 12 Volts and the third wire to the HEI, forth is for illumination. I confirmed this with Sun Pro technician.
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71 C-20
07 Magnum RT AWD
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