[Spridgets] Finding the need for a good timing light

[Edward Perez]

Looking to get a decent timing light.  I'm finding that I need one now that I'm once again playing with cars.  I see some of them have a "Tach Advance" feature.  Can someone explain that?  I'm used to just the plain old flashy light thingy.  Does this feature allow you to see what the timing is at different RPMs?  Is it something that I REALLY need?