Mike Stroz wrote:I might be wrong, but I was under the impression that these tachs took a signal from just one pole so it doesn't matter how many, it'll just get a signal once every rotation
Sorry, but most OMC motors have six pulses per revolution. But some have five. The ones with two yellow wires to the rectifier are six pulses, while the ones with three yellow wires to the rectifier are 5 pulses. Most tachs have a switch on the back to select, but not some of the early ones, which were six pulse only. Anyhoo, we don't know what specific tach he has, not that it matters.