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Did some more experimenting today, tapped in to the crank sensor wiring . Did get a frequency reading, however the tach didn’t like it. Went back to the ac on the alternator. Works as long as the dash light are on. Will check out the ecu pins when I get more time. Might be the best way.

The tach settings were set at 15. The jury is still out though, I drove the truck today and the tach was fluctuating some Almost like a bad ground? Funny thing when I turned on the dash lights it’s works good. Will keep you informed.

Yes checked the truck today seems I only have the polarity protection device. Yes inboard of the spare.

I will look to see if I have that?? I did see the polarity protection device. Got to check the lugs on that today make sure they are tight And clean. This truck doesn’t have master shutoff switches or any kind of outside start switch. Will post the tach settings I used.

LBCD, low battery cut off?? I have an open ac terminal on the regulator? Ok so todays monkey work. I took the ac terminal as a tach signal . Used a 1 amp glass fuse in-line and wired it to the tach. Used my scanner hooked to the diagnostics plug and monitored rpm. I entered off set...

Yes trying to add tach, should have purchased the j1939. I don’t have any connections to the ac post on the alternator?

Ok I’ve spent hours looking for a specific diagram for tach hook up. I don’t really want to tap the alternator. Where can I get the signal from to crank sensor ? Inside the cab??? This is an 2001 A1. The A0 seems pretty straightforward. Thanks. Mike