hi there,i had the same problem,ok..
1,price will be between 60 & 120 bucks
2,your sensor will be b4 your cat/converter on a little bit of pipe with 2 flange conectors on(1 end to your down pipe and 1 to the cat),it will be on top,also,they are a pain to get off,& have you had your ecl on,cause this will be on if you dont have a oxy sensor in,
3,i doubt very much this will have anything to do with your fuel gauge readings,
hope this helps.. :hi5: :hi5: