On-road and licensed. I'll use it in the spring as a back up to my 03 7.3 race car tow beast. Right now, I'm moving and have a ton to do. So just replace with appropriate bolts, OK. What is the difference between diesel and gas tanks and where can I buy the in tank sending unit??
No difference between gas and diesel tanks of the appropriate year. There was a change in diameter of the fuel sensor unit hole in the tank around 1988. The 1988 and newer have the larger sensor hole. However, gas and diesel fuel sensor units are different. The diesel unit is a two wire unit and the gas ones have four wires. People have been swapping the gas fuel tanks into diesels for years. A popular one is the 38 gallon tank for a 1988 F-250 351 for the 19 gallon stock rear tank. Spectra Premium F26E available from Rockauto online and Amazon. Brazing wire works fine to extend the swing of the tank float.
Diesel fuel sensor units are usually a Ford item at around $450 list, but you can find them much cheaper at the online Ford parts dealers. You have to call since the sensors are not listed. Also Isspro is supposed to sell an aftermarket replacement unit cheaper, Isspro is a top quality guage manufacturer. This is apparently a special order item.
Contact Mike Pliska at Isspro, he's an engineer who develops this stuff. worked with a vendor on this item and can supply contact information for the vendor who goes under the online name of CSIPSD.
If you have a pickup dually, they have the same frame spacing that the single rear trucks have, if its a cab and chassis truck then the frame is narrower and the pickup tanks don't fit.