[macojoe]

I have a 75 with the same tanks, Take them out its not hard!!

Dump all gas and wash with degrease, and rinse well!!

Let sit in the sun for a day to dry 100% Reinstall with new hoses and make sure the vent is clean and working.
I am sure you have the vents under the rub rail, this is a good time to relocate them, as they all leak while trailing!
I moved mine to the step up just above the rub rail, no more leaking!!

Also before reinstalling look at the gas pick up were you mount the fuel hose, it gets corroded and there is a ball in the fitting, that gets stuck.
If this happens you won't get any fuel and be banging your head why ???
I removed mine all toghter!

Also add a 3 way switch so you can change from one tank to the other!
The tanks will never drain even, no matter what you do!!
And when you run out of gas all you have to do is tuern the switch and your good to go!!
After a few times you will no excatly what you use on a trip and there will be no worries!

And as stated above you need to add a fuel/water separator !! It a must with this new gas!!

Sounds like alot of work but you can have it all done in 2 days, one to disassamble and clean and one to reinstall, all.

As for the gas gauge, throw it over board!! I am not sure what you have for a motor, but I stay out all day with a 175 hp and 20 gal tank is all I have ever needed!

Just fill both tanks and use one at a time, you7 will always be able to switch to the other tank when you run out.
Always switch tanks every trip to insure you are using the gas up and getting new gas in both tanks!