I had my gauge cluster off, when i reinstalled it the tach was inop. I figured it was just a loose connection...but after fiddling with it some more it still isn't moving... I'd like to test the connector for signals... what readings should i be getting? Can i also test the Tach itself? what voltage should i apply to make it budge/jump?

__________________

85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project