Delay box in Pro in Summit series

[JP1738]

I know they are not allowed to be used in Pro/No Box, but my local IHRA dragstrip does not care if it's in the car but not in use. I don't have a tach in my car, but my delay box has a screen that shows me engine RPM. They allow me to flip over to the RPM screen so I can stall the car up when I run No Box. I've never been protested and I certainly am not trying to cheat. I don't use it other than for a glorified tach. I asked the track owner ahead of time so he wouldn't be surprised to see me looking at it, but I was not using the transbrake, just swapping feet.