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**pjmoreland** · 07-28-2021, 09:48 PM

I found a functional TCC vacuum switch in a 1984 Chevy van today and did a little test on it to see how it behaves. It has some hysteresis built into it (about 2 inHg) unlike the vacuum switch TCI sells. Here's a little video I made to demonstrate its behavior:

https://youtu.be/McejhiEMph8

07-28-2021, 09:48 PM	#44
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,334	Re: 700R4 TCC Wiring I found a functional TCC vacuum switch in a 1984 Chevy van today and did a little test on it to see how it behaves. It has some hysteresis built into it (about 2 inHg) unlike the vacuum switch TCI sells. Here's a little video I made to demonstrate its behavior: https://youtu.be/McejhiEMph8 Last edited by pjmoreland; 07-29-2021 at 01:19 PM.