A/C cutoff and drive signal

[BIGglaSS]

I'm working out a few details of my 2004 5.3 swap. (blue/green PCM)

I installed a Holley Sanden A/C pump. It requires this $200 part #15982NOS to cutoff the compressor over 4000 rpm.
https://www.summitracing.com/parts/nos-15982nos

I'm not interested in buying another $200 part with 20 wires hanging off it. And, I don't really have a good place to install it. There has got to be a simpler cheaper way to cutoff the compressor at 4000 rpm?

Second, is there a PCM signal for "drive". I'm looking for a way to trigger door lock relays when shifted to drive.

Thanks