Re: seat and dash swap
I wired a DRAC into my '88 k2500, so I have spent some time looking at the schematics. Both schematics are available on this site in a post in the FAQ section. I just looked at the '90 and '93 and it looks like the bulkhead connectors and the ECM connectors have the same pin numbers. Of course you will want to confirm every pin. The cluster connector and DRAC connector will be on the donor harness so you wont have to repin under the dash if you get everything.
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