Nov 07, 2013 · Recently, my tachometer and hour meter stopped working on my 3930 tractor. As it turns out, the flexible shaft that fits into the tachometer drive adapter assembly broke. I've purchased a new one but having a hard time getting the new one in place (can't get it to seat into the female end on the bottom of the adapter).
Dec 21, 2010 · If your rpm gauge is reading 0, it is not running. All engines create some amount of rpm's, even at ideal. If your gauge is reading 0 it may be the engine is not on, or the gauge does not work properly.