Sprektrum Telemetry system. If anybody is going to put one on the mtx4, it took me 4 hours to get it all hooked up.
Not that it is hard to hook up, but there isn't any room and nothing that is included in the kit is usefull. The flywheel doesn't allow the RPM sensor to get close enough, the power lead needs to have a female end soldered to it, and there is hardly anyplace to mount the module.

I will have pictures tomorow. I got readings from the RPM of 43500rpm on my Maxx Power with temps at 195 F. and a speed of 52mph. This is a neet tool, but it isn't something that is "plug and play"