is a shut off valve a must on a dry sump set up?

No, especially not if you mount the tank low.

now come on dave, i wasnt gonna put one on mine, and after i talked to you, i decided to put a shut off valve on mine.I went to Lowes and bought a 3/4 inch gas ball valve, thats what i use. did you get one of those moroso oil filters? after i got mine, i took it apart and found out that the screan was about the size of a damn window screen, i guess it might keep the rocks from getting into the bearings hopefully tonight or tomarrow i will fire it up. when your down in wellsville labor day, come and get me before you go on your saturday ride. we will be down there friday night.
dave

i was just wondering cause the valve was being a pain. it will have one im sure. i will see you sat.

Hey Dave,
I just started my motor. Man, that baby kicked over on the first crank. OH YA!
How's yours coming along?

Dave

same thing just fired it up sounds good cant wait to drive it.