I have a 1995 s-10 Blazer. The guy i got it from said he put an electric tcase in then realized it was a manual. I was wondering if i could run my own switches for the t-case but wasnt sur how it would work with the vacuum system.

 

The vacuum system is the same. However, it will be quite difficult to get the system to work without a TCCM and the proper factory switch. That is besides the point that it really isn't the right direction to go in terms of reliability.