I'm in the process of finishing wiring my truck. I added a 327 and swapped the carb for TPI. I also installed a set of bedee 5" guages. I hooked up the speed signal sender (3 wires, black, red, & white) over the weekend but noticed that the TPI harness has a two wire hookup(grey & yellow I think) thats supposed to be spliced into the speed sensor. Can anyone tell me which wire goes where?  

The speed sensor for your bedee guages may be using a different type of speed sensor than what is used for the tuned port and the sensor is not compatable. I would contact bedee to make sure. If using the factory computer for the tpi, I believe the only thing it uses the speed sensor input for is the tourque converter lockup, and is not needed (depending on what tranny your using). it will set a trouble code, but should not cause any drivability problems.  

I defiately need to hook it up. I'm running a 700r4.  

what year and model is the TPI off of? Are you using the same computer? and did it originally have the 700r4?