Hey guys, got a 71 Sleekcraft i got about 8 months ago, haven't changed anything with electrical or connections on the tach, but when the motor is idling it seems to be correct, 500-1000rpm but the few times Ive had a few tests runs at Lake Pepe aka Perris Ive noticed that once on plane and driving 3/4 throttle my tach reads 6-7k? In the past I was told to look and see if the tack has a switch on the back, it doesnt at all and Im sure i cant be 7k all the time, if i let off from 3/4 the rpms will come down just like a normal tach. Basically it seems to do everything right but rmps seem way to high? is it possible my motor is turning that high rpm in stock form?!?!
any idea on what i can to make it more accurate, I just put new head gaskets and intake gasket b/c of water in the oil, dont want over rev this thing and cause more issues, Dam sure dont wana do the gasket replacement again. If not guess ill take her easy!