Congratulations on your new DeLorean! You will find that it draws attention everywhere you go. Expect to answer the same questions very often, such as: Is it made of aluminum? Where's the flux capacitor? Does it go fast? Isn't John DeLorean still in jail? Does it use a helicopter engine? (or Ford or Porche etc.) I am pretty sure that the problem with your fuel gauge is totally unrelated to the previous owner disconnecting the battery. The original fuel sender unit is very prone to failure, so chances are that is your problem. If so, there are 3 options: 1) fix your old sending unit, but that probably won't be practical. 2) replace it with a new old stock unit (very pricey according to DMC Joe). 3) replace it with the Tankzilla brand unit (also pricey but not as bad as the NOS original). My advice for anyone who is interested in buying a DeLorean is that they either better be a good mechanic or have a great relationship with someone who is. I suggest you start asking around before you need a major repair. Since the car is so rare and unusual, there are very few mechanics who are familiar with it. Welcome to the family, Walt Tampa, FL