Vacuum switch torque converter

[OkieBronc]

Have a 1985 Bronco. Duraspark swapped it, looking for more info about the vacuum switch from anyone who’s done it.
So the jegs vacuum switch is a good replacement for the Gm one. But on the duraspark forum it states to drill a hole in the back of the trans. The jegs switch does not look like it would thread into anything. Any info on this?

http://www.jegs.com/i/TCI/890/CMP3766B/10002/-1?parentProductId

 

[franklin2]

What are you using this vacuum switch for on a 1985 Bronco II?

 

[Shran]

What are you using this vacuum switch for on a 1985 Bronco II?

Guessing he's intending on using it for torque converter lockup.

I think most other people who did this used an electronic physical switch.

 

[franklin2]

I see, the convertor lock-up is electrically activated, and the mid 88 up units the 3-4 shift was electrically activated.