I have a 94 K1500 that I am doing a motor swap with.
Does this truck already have AC?
The billet serpentine kit I have includes a single wire A/C compressor. I understand my existing compressor has several wires , I mean a high and low.
Assuming your truck already has AC:
The clutch on the new compressor should be connected to the existing compressor's clutch wiring. We'll discuss the "how" when you've given us more information about your compressor. (Yes, I could probably give you an answer now, but let's wait until we have all the information and then answer the question correctly, once.)
Also,...
I believe in 1994 AC systems the R4 compressor was equipped with a high-pressure cut-out switch (visible as a two-wire connector on the back of the R4 compressor). If so, you should
try to provide a similar high-pressure cut-out switch function on your new compressor. This may or may not be possible.
So,...
Post pictures of the compressor (front, back, top, bottom, sides) to help ascertain where a high-pressure cut-out switch might be placed, and pictures of the wiring, and we'll go from there. If possible, provide the mfgr and part number for the compressor.
For the record, some Sanden compressors come with a fitting / boss machined into the housing
specifically for placement of a high-pressure cut-out switch. Similarly, your new compressor may have a similar fitting which can simply be re-used. The pictures I've mentioned (back, top, bottom, sides) would help to visually identify this fitting, if it exists.