Pic 1 - Remove the original regulator with 2 screws, first remove the two hose that is connected to the regulator one with the clip and the other one is the vacuum hose.

Pic 2 - This is how it looks when taken out if afraid keep the O ring in a safe place.

Pic 3 - U will need to grind off the section where my thumb and pointer is holding with a grinder.

Pic 4 & 5 - Notice that part with scar, just grind a little by little until u see the inner core.

Pic 6 & 7 & 8 - Sorry quite blurr...