Re: tach solutions on the cheap
If your motor uses a 6-pulse Tachometer, I just picked one up from a company that sells surplus boating supplies by the name of Great Lakes Skipper (
http://www.greatlakesskipper.com/) for under $30 shipped. I haven't hooked it up yet, but at that price I was willing to roll the dice. The only one they have at that price is a 6-pulse tachometer, and looking at the tach it seems that it had the little dial in the back to change the pulse settings, but it has been removed.
This company also sells on e-bay, so you may do a search there and see what else they have.
-Eric