[Braunschweiger]

It is only for Adjusting in the Car, it allows good conclusions to be drawn about how the Carburetor works. Transitioning from the idle system, to the main jet, with the accelerator pump and at Holley also the PV valve working in these Areas, can put you on the wrong track, without the experience of an Old Mechanic. It helped me, a lot to understand my carburettors and adjust them properly. The AFR is not permanently in the car, it always went to the one who just wanted to tune his carburetor.