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I ended up ordering a different tach and it has been working fine. Search for this on Ebay M998 HMMWV HUMVEE BRAND NEW TACHOMETER Gauge 12469030

Understood. I was hoping with this thread that some electronics guru could explain the differences in the alternator AC outputs between the two trucks.

My tachometer only has 1 signal wire terminal.

Tried it today; no luck. I'm not getting any type of reading off of either wire with a DVM.

I'm having problems getting a tachometer to work on my 1045A2. It has the 200 amp alternator and I'm hooking up the signal wire to the AC post, yet getting no movement on the needle. I have the same exact tachometer on my LMTV and it works fine when installed there, so the tachometer is good...