I LOVE THESE!!!! drove an 80's vette with it.... watching the rpms rise was sooo much more exciting

 

Will these fit a full size Blazer or just the s10's?

 

I think you'd be butchering your dash. I doubt it would just fot right in there. Supposedly you can't convert from analog style to digital according to Carl (the e-bay guy) but if you really have to have it check out this link. It's for S10s but you would just have a few more steps to do not to mention one hell of a lot of research first.
http://people.oregonstate.edu/~akeym/

 

Dakota digital makes a kit for k5 blazers to make them digital, be prepared to spend some money tho.

 

BUt they are NICE!... I had big plans of using that to replace the dash in the 77 camaro

 

Yeah when I become rich and famous, after the rockwell SAS, bigblock swap, I'm gonna put a set in my blazer.