I recently purchased a 1968 Glaspar Citation with a 1990 Johnson 115. While the engine and boat were in great shape, the wiring, gauges and tank were not. I ripped out the old metal tank and grabbed a Moeller 12 gallon tank from my dad that I plan on putting up in the bow. After I got my new gauges I realized a small problem. The tank I have has a mechanic fuel gauge. I figured I could just replace it with an electric one but it doesn't appear to be removable. Any suggestions? The tank is a Moeller 630013P. Will I have to purchase a different tank or is there something I can do to get this working? Also what size fuel line should I run with it? My assumption is 3/8" but I want to be sure. Thanks!