Ok, I know this has been asked a couple hundred times, and I have read threads for hours, but still haven’t got my answer.
swapping a 3.4 into my 93 Toyota truck. I have the doner truck, with harness ecm and all. What do I actually have to do to make the 3.4 come alive in my truck. I can do all the battery relocate, air box mods, oil pan swap, dipstick relocate. If I put the 3.4 ecm in my truck, and hook the engine harness to it, what do I have to do to make it start with the key, and my gauges work?

 

i would like the same question answered...

 

You will need to re-pin some connectors (which I did not do so I can't help there), or go to offroadsolutions.com and purchase their adapter harness. That will tie in your donor harness to your trucks existing dash harness. You will also need to solder in a resistor on the back of your tach to make it work with your new ecm. Plenty of write ups available for that... I even have a picture of it on my swap thread.