Working on converting gas to diesel in a 89 Jimmy. I need wiring diagrams for an 89 K5 6.2 diesel. The engine is a 6.5TD out if a 92 C3500 so it has the mechanical pump but what I'm wondering is how to wire up cold start high idle using harness from 5.7 gas. Should I just put it on a switch? I'm installing a push button for the glow plugs. And need to run a vacuum pump for my heater controls. Will a cam driven vacuum pump from a 6.2 work or do I have to go with the belt driven pump? Also it looks as if I have to remove heater/ac box from firewall. Any info on this? If I just remove box and plate the firewall how do I run my blower motor for heat? I already know that the axles won't hold up and I need hydraulic brake booster. Have all the parts. Just waiting to get engine together to drop in. I just need advice and/or pics of one of these already installed.