The Tiny Tach will work on a Slick Mag. One removes the mag harness cap, drills a 1/8" hole in it, pass the red wire through and wrap it around the unshielded portion of the harness, inside the cap. The new TT are fully programable and will run on just about any engine, as they can be set to sense 45 degrees 8 sparks per rev, 60 degrees 6 sparks per rev, 90 degrees 4 sparks per rev, 120 degrees 3 sparks per rev, 180 degrees 2 sparks per rev, 360 degrees 1 spark per rev, or 720 degrees 1 spark per 2 rev, all in the same tachometer. They also now have a resetable job timer in them, so on can set the oil change interval for example at 25 hours and it wil let you know when you reach 25 hours.
Also have a UMA 2-1/4" tach that senses the singnal off the magnets in the magneto in stock. If you run off the P lead, be sure to use a 1/4 amp fuse or so between the mag and the tach. Steve Bennett ifly...@msn.com