Hi guys. Very first post. Have been reading lots of posts trying to figure this out. Finally writing.
I have a 1988 Mercury 25 on a '60 era Duracraft runabout. The serial on the motor is 0B334469. I am trying to figure out how to put a tach on this motor to find out what the RPM's are. Everything I have read on here says rpms at WOT. I don't want a permanent tach just something to find out this information. Thanks for your time.