1986 GMC Astro rebuild...questions

LOL...this thing is full of surprises--as well as maddening items too. This attached pic is a "micro switch " under left dash, triggered by the clutch pedal...what in blazes is that for?
Let's see...what did I learn today while outside messing with it? Curiosity still nagged at me at getting the Bendix air dryer cartridge out from the base. That cartridge case is TOUGH! After many failures with even a chain drive wrapped around it, I went for the gold and took an angle grinder to it...well, it didn't go that easy, as I found out just how well built it was. And those warnings about the high pressure spring in the end of it? Check that item too! LOL...it DOES have some pressure behind it! Now I know what exactly was inside it. Curiosity satisfied. I think I can still salvage this unit with just a new cartridge...
Decided that while I was projecting on several other items on it that I'd take the steering wheel off and try some repair to restore it...guess what? Been about 5 hours on it, and yep--it's STILL mounted! I've heated, PB Blasted it (over and over), hit around it with hammer and still not moved a smidgeon. Can't get a puller to work and I've pretty much trashed the hub area of the wheel by this point too...
HOW in the world...
Oh, and thanks again for the replies and helpful comments. It's very much appreciated...

 

Ah...interesting stuff. I'll take a closer look and see where they run to. And post a pic or two...I can almost make out the faded label on that top valve but not just yet. Can't seem to find the right light and angle where I can see what was printed...

 

I thought so too...felt like it as well but the first bolts didn't hold...felt like bolt could have been a touch bigger. Those were 1/4 inch so I went to 5/16 and they are too big. So off to Ace Hardware in search of metric ones. 6 and 7 mm seemed to be in the right area so I tried them too. One did seem to "fit" however with the puller pulling they pulled out too. I'm perplexed to say the least. Everything so far on this thing has been a nightmare to pull off. May end up buying a whole case of PB Blaster before too long...lol...