the250guy

ive decided to put a potentiometer in to prplace my tps.
what wires from the plug doi put where?
I was under the impression that the two terminals that change cant be ground.
what i did was take a 4 strand wire and just use 3 of them- the black(ground) and then the red and white. i connected the white to the whitish colored wire at the plug. The red one replaced the orange/blue and the black went to black for ground. is this right? i followed the writeup by tuckerdee step by step. i dont know what i did wrong.
somebody please help... =[
EDIT- if i turn the POT too far to the left (turning the voltage down) too far, the speedo goes out and i noticed that the O/D off button does too. But it does NOT mess with the radio.
thanks in advance...
ive checked voltages on everything i can think of. so im just stumped.

the250guy

one more thing id like to ask...
what voltage should the pot be set at to shift into OD at say 45? thats one of the only things i havent been able to find on here -what the voltage should be on a pot to shift, and if anybody knows about other speeds, do share. thanks.