Running a haltech 750, so the tach isn’t running by the trailing coil anymore. The ECU gets the rpm readings, and there is power to the tach. The tach was working fine for a little bit and then one day it just went dead. I tried swapping it out with another and it didn’t work. Meter fuse is good, not blown, and I cleaned the connectors behind my cluster shiny. So either I have 2 tachs that went bad or I have to hunt down a wire, right??

 

is the coil actually working?