TU-32-20 Compucheck Fuel System Pressure Test Gauge for Cummins Diesel Engines Fitment: TU-32-20 Diesel Fuel System Pressure Test Gauge - Compucheck Fits Compuchek test ports on Cummins diesel engines as well as other diesel engines that have been outfitted with the Compuchek test port. Features: 1) Used to check fuel system pressure on diesel engines with a Compuchek test port. 2) The hose assembly is made from synthetic rubber, finally constructed with red coat finish, showing good performance and lasting service time. The gauge is equipped with high precision dial to ensure value accurate. 3) 3-1/2", 300 PSI precision gauge. .