Hi, just getting into the tuning aspects on my 88 tbi chevy 4x4. I don't currently have a speedo hooked up because I have a doubler setup (2 transfer cases) and the port in the rear that originally housed the VSS had to be blocked off for a shifting mechanism. So, my question is, is the VSS absolutely necessary in getting a decent tune on this thing? it's not highway driven or daily driven, just want to get it in the ballpark.
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