I did this a couple weeks ago, but the conversion was relatively easy. The tach isn’t accurate, nor is the speedometer, I believe it’s set for 3.42’s and 265/75’s, and I have 3.73’s with 28.5”/29” tires, whatever 235/75 converts to. It reads 5 faster than actual travel speed.
Disregard brake light on dash, I’m sure it’s part of my wiring fiasco, the park brake isn’t set mostly because there’s no cables.
SES light is low voltage to tps, egr, and map. All of them have been changed, still get a light.