[Skidmark]

1975 TA. Sticking out of the shaker assembly on passenger side.

[Red80TA]

TVS Thermal Vacuum Switch. Has different uses on different models. Simple setup is a vacuum line to it and runs to something else, but its operation is temperature controlled, either to work only when cold, or to not work when cold. In 1975, I think it diverted to the secondary vacuum pull off. In other models it also ran to the snorkel diaphragm for cold starts.

[Skidmark]

Originally Posted by Red80TA

TVS Thermal Vacuum Switch. Has different uses on different models. Simple setup is a vacuum line to it and runs to something else, but its operation is temperature controlled, either to work only when cold, or to not work when cold. In 1975, I think it diverted to the secondary vacuum pull off. In other models it also ran to the snorkel diaphragm for cold starts.

Thanks for such a through answer exactly what I was looking for.

[burd]

Hmm. Pic is the size of a postage stamp. Barely can see