alright so her it goes. I just did a 06 vq35de hr swap in my 03 z which had a vq35de in before. I swapped out the ECU and harness to a vq35de hr and then got the NATS system removed. Removed all my OEM gauges as well. Went to go to start the car and I got nothing there were 2 grounds that I had cut off for the headlights and airbag and crash sensor harness. Grounded those wires and now my fuel pump will come on from ignition but nothing else. I ran meter on the power pins for ecu and they are not getting power any ideas? But fuel and bcm are turning on.

 

Your answer is in my thread about this same swap. The 06 swap is not an hr as well it's a rev up.