Yes Steve, that's what we have concluded also... the speedo wire runs through the abs and cruise control controllers and on to the speedo. The speed signal, as far as we could tell, is sourced only from the pumpkin sensor. Had it hooked up to a scanner and rear wheel rotation was the only one that affected the mph readout on the scanner. I just wanted to see if anyone had ever seen this issue before and had a definitive solution. ABS was the direction we are headed at this point...thanks