Saw this post on Sunday, so I ran out and took an Harley oil bag that is being repainted at the house and compared it too a 1975 F model super sport and it doesn't work. On the other hand my old style (large mouth cap) oil bag will hold a Harley oil temp gauge as described. My harley style oil bag plug with dip stick will slide into the 750 oil bag, but I wont lock down. A nice compression fitting. I will probably run one, when I use that tank
Bubba