My tach hasn't been working and I checked all the wiring and it doesnt look broken or chewed up. So I removed the magnetic pick up sensor and wanted to see how I can test it. Can I use a multimeter somehow, like ohms or I read something about AC volts testing. This is for my 2940. I'd like to test it before I go and replace the sensor, if that is way. Thanks guys, I look forward to your advice.