I have an 86 Iroc z, with an 88 tbi wiring harness modified for tpi, the 700r4 is out of the same car as the wiring harness. My halech e6gm digital fuel managment needs a road speed sensor input signal, but the 86 car has a speedo cable that screws directly into the tailshaft. The wires and connector are there I just dont have anything to plug them into. If I put a sending unit on the tranny then i have nowhere to hook up my speedo cable, does anybody know if im missing a part, is there an adapter or something that goes in between the tranny and the speedo cable for the road speed sensor, somebody please help