Product Description Application: Perfectly fits Compucheck test ports on the fuel system for Cummins diesel engines, also compatible with other diesel engines that have been outfitted with the Compucheck test ports. High Performance: Specially designed to easily & accurately check the fuel system pressure on diesel engines with a Compucheck test port. The gauge is equipped with high precision dial to ensure value accurate and help to get your job done right. Comparable to OEM part number TU-32-20 both in quality and functions. Package Includes: .