on my XR650L the gas tank is a after market Clark... 4.5 gal. I think ( pirty small for that gas guzzler) I think I'm only getting somewhere in the 20's for MPG !!!!!
I was thinking of just doing a clear tube along the side of the tank, all I would need is the plastic fittings or brass ones if I can find them.... I think that would be simplest and fairly easy to do.... the tank is thick plastic of some kind... I expect it is PVC plastic...
..... I've had a few bikes with the clear tube type of gas gauge and they work real good
and are bullet proof ! never ripped one out by dumping it while trail riding anyway.
....
I can't get up any enthusiasm for going for a ride today... so I am just going to go take a nap ! LOL
Bob.......