I've been using my LM-2 for a few months now with good results. As mentioned above, it does start up occasionally in record mode. There is a firmware fix for that. I haven't loaded it into mine yet, because it's a pretty rare occurance. RPM seems to be around 200RPM higher than my tach, but I really only use it as a point of reference when reading logs. Keep in mind it's a delicate electronic instrument. Run good grounds to a common point for all the signals especially if you use any analog channels. Also, try to keep the input wiring away from any high current carrying wires. If you have to cross any high power stuff, try to cross it at 90deg. My