psi harness help

1995 Silverado 4l60e swapped to a lq9 dbc..who can help me with the finishing touches on the psi wiring harness? I only need help with the under dash hookups. where do I tie into my stock mil lamp? how about the speedometer?i have cruise control added into the pcm but where does it hook to my stock cruise , right at the cruise module on firewall?I asked lextech but he only does 96 and newer any help would be appreciated I have looked through the threads and find different ways things have been done but nothing specific to my application

Also wondering if I can just remove my old ecm or if it actually controls other things in the truck not related to the old engine?

I have psi harness also. But i have a 91 silverado and i just took out every thing or cut it. You don't need the stock ecm only if your going use the trucks tranny, if yours upgrading to 99- up tranny just delete the stock ecm.

With the underdash wires can't help you there. I'm planing on autometer gauges

While I don't recall the exact wires, I can tell you on my 92, all of those can be hooked up behind the glovebox. I left my stock ecm in the truck.