[ERASER5]

You do not need new fuel tanks. Just clean out the diesel fuel. Fuel gauge will be OK too. It is a float and does not care what it floats on.

Do you have a tach now? If not, no problem, you do not really need it. If you MUST have a tach, and cannot bear to have extra lights (glow plug), get a full dash from a gas truck. Some rewiring my be needed, but that will be true no matter what.

You will need all of the accessory mounts. The actual accessories will fit the mounts. (alt, power steering, AC)

Since you have the batteries, and you have the 2-battery setup already, use it. More power for starting, longer time that you can run power with the engine off.

Remember, most of these F250 had gas engines, so all of the parts are swappable. The really hard part will be degreasing the engine bay. The 6.9s marked their territory well.

All that aside, have you looked for a 7.3IDI? It is everything a 6.9 is only better.