[70GMCer]

After doing more research, I found that they make an all in one hi-lo Binary Switch.

They have different pressure ratings though.

Some are rated at 28 off & 29 on low side, 400 off & 398 on hi side, & so on.....

Would anyone know which one to get?

I did look up the part number on the original switch to see if it was a hi-lo one. It just lists for low pressure.

So, I'm thinking that there wasn't a hi pressure switch on these truck ac systems..