Is there such a thing as a tachometer for these scooters?
I have a digital tach (infra red, I think) that I can use if the case cover is off the bike. But it needs to be aimed at a rotating part to register. I was thinking of one wired into the bike
We use the analog Stage 6 tach's. I just gave the last one away I had sitting around the garage. We mount them on the windshield post. Looks good, glows a lovely blue. For tuning, I use a STIHL inductive tach that can be changed from 2 stroke to 4 stroke. Bought it at a yard sale in a lot deal of small engine tools. Velcro it were you need it.
If you go electronic, you can use one of those cheap inductive tachs that has a lead you wrap around the spark plug wire. Or you can try to pick the 12V pulse off the CDI lead that triggers the coil and use a regular electronic tach.
But remember, many scooters use wasted spark ignition (and I believe the Buddy is one of them), generating one "spark" per revolution, not every other revolution. So, you need a tach that can be set for single-cylinder two-stroke mode.
The Blur has a tach. There are three wires related to the tach; +12V from the main switch, ground, and input pulse. The input pulse wire is connected to the red wire that goes from the CDI unit to the ignition coil.