Bigger project but looks simple enough.The rare 7 gallon aux fuel tank for 110's. Increases fuel capacity from 20 to 27 gallons & makes a big difference in range and the weight is down low as opposed to where the fuel would be in jerry cans.
There was recently a new one on ebay-proverbial hens tooth. That Saudi truck I had has one- might be able to take measurements from that one.
it looks simple enough with the only bend being the side facing the tire. In talking with the fellow I sold that truck to last weekend he said that the gauge reads full until the aux tank empties (ie first) and then the gauge reads acurately on the main tank. No switches etc to wire or plumb in-gravity feed. The aux tank uses the same filler and once installed requires no operator interaction unlike many 2nd tank applications.