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I have a 2008 TBSS harness and OS with a LS3 mated to a t56.
This is on a 1999 chevy s10 blazer

Did you get the vss working?
Same problem here, harness by Current Performance E67 ECM t56
Dash cluster only goes to 10MPH and HPTuners scanner always reading 158MPH.
GAS PEDAL DBW doesn't...