my Oday 26 inboard does not have a electric fuel guage. I measured the tank height ( if I recall it was 17 or 18" heigh) , I bought a MOELLER sending unit and a MOELLER guage from West Marine . I need to cut the sending unit to lenght per instructions and wire the guage then mount it in a place where I can see it easly ( probably by the manual bildge punp). This I have saved from a winter project. P/S the current guage is flush mounted on top of the tank and is a manual guage not electric.