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LS short box · 12-23-2020, 05:50 PM

I would buy a new harness. It's no fun chasing electrical problems. I've never used a reworked stock harness. I like Howell and Speartech harnesses. They can also reprogram the stock ECM.
I've never used the trans position sensor attached to the shift lever. I have used the shifter neutral safety switch on my LS/4L60E swaps.
You do need to use valve body wires and the VSS wires.
I would get a new intake. Truck intakes are cheap. If the engine has been sitting for some time I would pull the injectors and have them cleaned.
Oil level sensor in the oil pan is not needed. I replace the stock one with an aftermarket plug.
The stock oil pressure switch is at the back of the block as in your pic. The cam sensor is next to it.

12-23-2020, 05:50 PM	#7
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,920	Re: Lets get this LS 5.3 running! I would buy a new harness. It's no fun chasing electrical problems. I've never used a reworked stock harness. I like Howell and Speartech harnesses. They can also reprogram the stock ECM. I've never used the trans position sensor attached to the shift lever. I have used the shifter neutral safety switch on my LS/4L60E swaps. You do need to use valve body wires and the VSS wires. I would get a new intake. Truck intakes are cheap. If the engine has been sitting for some time I would pull the injectors and have them cleaned. Oil level sensor in the oil pan is not needed. I replace the stock one with an aftermarket plug. The stock oil pressure switch is at the back of the block as in your pic. The cam sensor is next to it.