Recently my gas light came on. I ignored it for a bit and still had a good 20 miles to go before I was completely empty. When I finally turned my car on to get gas, my gas light was no longer on, the gas reader wasn't working at all. When I tuned to my range to see how many miles I had left to drive it simply said ---. My gas reader stays on 0 and doesn't move or anything...I put a little bit of gas in it, but the reader still says 0.The car runs, but I don't know what to do about this...