I've got 14" wheels on my  "95 Sunfire. I'd like to install bigger ones. Maybe 17's or 18's. I'm still keeping in mind a safety factor! Question is, how do you reconfigure odometer mileage. Can it be done on the cars legally? I mean messing with the odometer?  

You will be going faster than your speedometer is reading and the odometer will show less miles than you are travelling (so gas mileage calculations will show waaay worse mileage than you are getting, but the bigger wheels will probably decrease your mileage some).  You cannot alter the odometer in the dash cluster.  I know in OBDII systems there are ways to reconfigure the speedometer, but I am not sure yours is an OBDII system.  Very few cars in 1995 came with it and it was mandated in 1996.  Unless someone else has a better answer I would take it to a Transmission shop after the new wheels are put on and see if they can calibrate the speedometer(which is legal). I've never had it done but I would think they would be able too, or at least direct you somewhere.  

Sorry it took soooo long to acknowledge your reply. Major computer problems. However I appreciate the info on this and the other ???'s I had on other topics!