My Girlfirend just got a 99 v6 automatic. The guy told us that the gas gauge isn't grounded properly from the previous owner and it goes in and out. how do i fix this?

What is the rim size and where do i get stock rims? (i'm checking craigslist right now) she wants to keep the racing tires but we live in MI and i tried to drive in snow the other day...one silverado and 2.5 hours later i made it the 10 miles home. We need a second set of rims for snow tires.

The previous owner also told us that the owner before him had the transmission switched to some kind of truck transmission, because they were gonna twin turbo it, but wanted to keep it automatic. I believe him, cuz i'm not getting the torque i should out of the 3800. Any ideas what tranny is in there? and have any ideas (short of putting the normal tranny back into it) as to how i can regain some of that torque?

I think that's all for now. thanks...
oh yeah, still no supercharger for the RWD 3.8? (i thought the firebird/transam 4th gen was a rwd with a sc, but what do i know)