digatal gas gauge reads "E" and blinks. when set on range, miles go to 275 and go up and down different miles so I can't determine if i am using or how many miles are left in the tank of gas. this is with a full tank or empty.none of the other settings show or change blinking "E".also maybe unrelated power locks used to automatically lock when car was put in drive and unlock when put in park,that no longer happens.