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Re: 1987 GMC V1500 Sierra Classic LS swap/build
Quote:
Originally Posted by Mtrhd329
When i was working on my speedo i found that my 2001 pcm had two twisted wires coming in from the vss to feed the pcm and then a single wire out for the speedo. 4k ppm i think it was. I am using a 94 z28 cluster and it works great. You should be able to run your gauge directly off the speed output wire from the pcm if the pulses match. Not sure about how the transfer case needs to interface though im 2wd.
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You are correct there is 2 twisted wires, there is actually two plugs at the end of the transfer case harness that share those exact 2 twisted wires. I tried to tie in the 91 VSS plug and got nothing. 
Pulses do match it will interface fine just gotta get the wiring correct.
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1988 GMC R3500- Cut Brothers 4WD Conversion Kit, 6.5 TD NV4500/NP208 D60 14BFF
2020 1500 Silverado 3.0 Babymax
2002 2500 Silverado- 6.6/ Allison
2010 CTS V- The "NastyBuzzard"
1979 Trans Am - Eventually getting 6.0/T56 swap with boost
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