Join Date: Nov 1999
Location: Central California, USA
Check the firewall again. It's a lite green wire and I think a white wire. Look where the throttle arm comes out of the firewall. go toward the center of the car and up a couple of inches. It would be in the area behind the left cylinder head or valve cover. Perhaps just a little more toward center. It's that way on my 67 Camaro with four speed, I've owned since new. It was that way on my 68 Camaro with powerglide and console shifter, I remember removing the switch when I changed the trans to a turbo 350. Of course that was 30 years ago!
The plug does not look like a plug. The part in the firewall is rubber and protrudes about a half inch, it's about an inch diamiter. If the wires are plugged into it you will have to look carefully or it will just look like a rubber gromet coming out of the firewall. Hope this helps.