I created an earlier post that was probably overly complicated. I was wondering if a tach control unit is necessary on a 1986 DT115 with Suzuki tachometer. It appears mine is bad and my tach. will work if I bypass it. I just don't want to damage anything else (ecu, rectifiers, exec.) I would love to get on the water tomorrow, but if I can't find out what this thing does and if it is needed, I'll cautiously wait. Thanks much