After a lot more research I think I have a plan going forward. I have a VSSB/DRAC from a '94 suburban that I will wire in parallel to the original DRAC. New DRAC will provide both inputs to the PCM (pins F12 and F13) and will probably eventually provide the output for cruise when I get that working. Original DRAC will just provide output for speedo. Using the info and calculator on the DRAC page on TBIchips.com, it looks like I will need to move two jumpers around based on my tire size and gearing.
I will have to splice in a new twisted pair for the two wires from the T-case VSS to feed the new VSSB. Any suggestions where/how I should do the splice? Wiring will be as follows for pins C7-C15 on the VSSB:
C7: VSS Input, lt grn/blk (twisted pair with C12, from t-case VSS)
C8: engine ground, blk/wht
C9: 12v power, hot in RUN, brn
C10: ABS (won't use), wht
C11: VSS Output to F13 on 7427, dk blu
C12: VSS Input, ppl wht (twisted pair with C7, from t-case VSS)
C13: VSS/Trans Output to F12 on 7427, brn
C14: Cruise control (won't use initially), red/wht
C15: Speedo input (won't use), lt blu/wht
I revised the original post by deleting the excel attachment and replacing it with my latest version that has all edits and the added sheet for new VSSB wiring.
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