I was going to say the same thing as Comanche SS. You can do the OBDI 91-95 HO swap, but I don’t think you’re gaining much over a Renix truck because the diagnostic tools don’t really exist for those either. At least for Renix, the REM exists. A 97+ swap gets you OBDII, but you’re still dealing with 25 year old parts. And in either case, you are rewiring most of the truck.