gopokes

So I am running a 5.3 out of an 03 Tahoe, and trying to use gauges from an 02 Camaro in my 71 C10. I had my wiring harness cut down and have all my gauges working except my oil pressure gauge. I have had mixed advise on another board on how to hook it up. Some say in the Tahoe it has to run through the body control module, others say I can run it straight from the serial data line. Neither worked yet, and I tried going directly from the oil pressure sender on the back of the engine, but no luck with any of it. Does anybody know how I can make this work?

Thanks in advance!
Donnie