For Sale, Daytona Deluxe Engine Exhaust Analyzer, Model 8610. Used to balance the fuel system for optimum balance and performance of the fuel system on 4 Cyl, 6 Cyl and 8 Cyl gasoline engines. To use, center the pointer to start, run the engine to opreating temp, insert gas sniffer into exhaust pipe, when you have a steady reading adjust carburetor if needed to balance the fuel delvery. For twin exhaust cars, test each side of engine exhaust independantly and set accordingly.