Okay, I found the pushback gauge. The reason I suggested it was that instead of sitting there and waiting for the aircraft to turn (1 full length), you can pay attention to some of the other stuff needed for takeoff while this gauge backs you up and turns you for a counted number of seconds. Very handy to have around.
Go to
www.avsim.com and in the search field type in this: RCBpb-20.zip. That will bring up the gauge. There is also a txispeed gauge that keeps your taxispeed at a constant speed without having to adjust anything. Really good for those who aren't really adept at ground handling. At the same URL, type RCBts-10.zip into the search engine. There is one other part to this set: RCBta-10.zip. They all include instructions on how to put them in panels, so it shouldn't be too hard.