I forgot Lee Beard came up with the actual "Terrible Towel" when he put one on the accelerator pedal on Gary Ormsby's TF when he had a string of great reaction times, just to fool with the other racers. Dale's towel came later, with that great question mark on it. It covered an air operated lean out system that opened up a jet at about 3.6 seconds into the run.
Dale had a lot of tricks, like using a kickdown switch from a junkyard GTO hooked to the shifter and to a light bulb on the back of Kenny's FC to find out KB was shifting right after launch, not where he needed to.....sort of a lie-detector system!