I am running a 2500 and have wired in the tach out put via a relay from one of the left over injector dpo’s which is not working. Unfortunately after doing so I have read that the tach output should be from dpo 1-5? However On the haltech relay wiring diagram it says to use any available dpo so now I’m confused.
Before I go to the massive headache of pulling dpo 1 back out of the harness is there something else I should try?
I have the resister wired between the relay and ecu.
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