Re: 120 L-Drive tach is whack. What pole is it!?!?
Force engines used a 20 pole tach. There are 20 discrete poles on the stator. As far as I know, it is a special tach common only to Force and a few Merc engines. Teleflex and possibly other brands sell them and you should be able to buy one here on Iboats. Teleflex only makes 20 pole tachs in one version---I think it is the international red series and I think it is 0-7000RPM---but don't quote me. Too late to go down into then garage and look.
According to Teleflex, tachs can stop in any position when the engine is stopped but should zero when the ignition is turned to on with the engine not running.
Before you replace the tach, check the back. Some of them had a rotary button or switch and position 3 was for 12 pole tachs; position 4 was for 20 pole. --Nor to be confused with the tachs that have 1, 2, 3, 4 positions for number of cylinders or pulses per revolution. These tachs do not work with Force engines.
