Hi there, im new and seeking for a solution to MY circuit task ive made some tests with a LM3914N.
It is very simple to use a LM3914, since you will be using the cars power, fist try a votage regulator so you can have the same (lets say) 5 volts. The simplest array for this LM3914N will do just fine, you onley need to try some diferent value pots (mabe 10k to 100k). The real trick is how you are planing to make the gas level move the pot. Other wise its all done