Received the new tachometer I ordered from Bailey's (site sponsor) the other day. I bought the same one their shop uses, the SenDec STS5000. It's only a tachometer and has no other features or frills. Works well without the alligator clips too. Used it to tune my 039 up at the cabin yesterday. I only had it running around 8800 RPM. Once I set it up at using the tachometer to 12,800 RPM, it ran well through some leftover rounds that were around 20", or so. No bogging at all, unless I pushed on it. Got the tachometer for $77 and would definitely recommend it to others.
The SenDec tachometer.