I imagine that the 65 and 66 300's use the same fuel sending units. No one seems to have replacements for the 66 and mine is un-rebuildable, however, Laysons has new ones for the 68 and newer. Anybody know if the 66 is the same as the 68? Larry W Jett 950 Woodside Road Suite 4 Redwood City CA 94061 650 368 3966 [Non-text portions of this message have been removed]