There are any number of ways to accomplish this, so take your pick...
You could write a sub program and call it after the count increments:
IF [GAGE GT 6] NDRP1
NDRP1 CALL ODRP1
OR you might want to wire in a switch to "force" it to drop off at will.
When the switch is on - call the ODRP1 sub routine.
IF[R801 GT 0]NDRP1
I'll have to dig through my archives to try to find you some more info, but can't do it right now.
Do you have a basic program that you are already working with?