Manual Tranny plugs

[bill elhart]

Finally getting back to motor swap project. Also had tranny gone thorough. Of course I did not label things good back in January when I started. I have two plugs on top of the manual tranny. One is for back up lights and not sure what other one is but it appears I broke it. Any help?

 

[bp71k5]

No idea. What trans?

 

[diesel4me]

Some years in the 70's had a spark advance delay solenoid rigged up that shut off the vacuum to the vacuum advance when the transmission is in high gear..besides the back up lights,thats the only other thing I can think of that switch may control..