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The TU-32-20 Compucheck Fuel System Pressure Test Gauge is for use on Compucheck test ports on the fuel system of Cummins diesel engines, as well as other diesel engines that have been outfitted with the Compucheck test ports. The TU-32-20 contains a hose assembly with a female Compucheck fitting on one end and a 3-1/2 in. 300 PSI gauge on the other.