I bought a new Tractormeter and cable and hooked it up. Using a dwell meter the tach ran 25% higher RPM than engine was running. The pulley on the alternator was 3.20" diameter so I needed a 4.00" to reduce the alternator RPM buy 25%. I found a Powermaster 182 (4.00")aluminum racing pulley that fit perfectly. After replacing the pulley the tach is about as accurate as one can expect, maybe within 50 RPM's. I have the idle set around 700 RPM and the alternator still puts out over 13.5 volts. Bill at Howard was great to work with and definitely has a great product for those who want to do a 12v alternator conversion yet want to keep the original tach operational.
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