2008 Jeep Wrangler X Sport Utility 2-Door RHD

Thanks for looking.
I am selling my used 2008 RHD Jeep Wrangler. I'm the 2nd owner. Transmission went out on route, I decided to purchasea newer Jeep due to the fact that it was going to be a few weeks to get the repair done on the transmission. Ended up replacing the transmission with a used one that has around 60K miles on it. Check engine light is on due to the gas cap light being on. I have replaced the gas cap twice and the light will go out for awhile and then come back on. Also the change oil soon light is on, I changed the oil every month but can't figure out howto get that light off (route is 100 miles a day so I figure 25 days a month equals 2500 miles) Route is mostly gravel roads so jeep is dusty (dirty) Back seat was never used unless the boss done a route inspection. I was going to keep this a back up but my finances say otherwise. Has new brakes and new tires.