Now that my '85 Force 85hp is running, I seem to be having trouble with WOT. I can manually hold the throttle all the way down, and GPS says I'm at 32 mph. When I let go of the throttle, it slows down a bit to around 26 mph. Why doesn't it stay at WOT? Is 32 mph at WOT about right for my motor pushing an 18' hull?<br /><br />Also, is there a way to check the RPM's without installing a tachometer? Is it possible to install a tachometer on this motor, and if so, how much trouble would it be for a novice like myself?