I have a 2007 avalanche ltz that I replaced the engine with the guy who originally started the tear out had cut my wiring harness to most sensors. Managed to solder it all mainly back together and had the engine running do to a toggle switch off of starter. Reason being is I have a no crank no start. First let me say I don't have the pin out correct at the neutral safety switch so if anyone has a wiring diagram for me that would be amazing I have the newer model where it's only a one plug and has I believe 6 wires that go into it. Second I know that the safety switch isn't angled right so I will have to tinker with it a little bit. I have only one code coming back to me on my obd which is p02123 my reverse lights stay on and no illumination under the shifter letters. Gas gauge is the only one that doesn't work at the time and everything else is ok. The engine doesn't stall or run rough very smooth on throttle without moving. Idles back down as it should. Any help would be much appreciated i have rebuilt this whole truck from top to bottom and it's my very first vehicle I've done myself. So anyone in my shoes knows what it feels like to be this close but so far away. PLEASE HELP ME!!!