I have been running the DX3S with telemetry for a couple of years now. The temp sensor works great, always very accurate. The battery voltage has always read .5 volt higher than it actually is. The rpm sensor doesn't work very well, at least for high rpm applications, might work better on a lower speed gear to do mph. When I tried to use it for engine rpm it would work to about 15000 rpm, then was unreliable.