On the Bosch K-jet systems this pressure can be measured at the top of the fuel distributor by connecting a continuous injection system pressure gauge from the top fitting in the fuel distributor (this is the horizontal one) to the warm-up regulator. When installed the gauge will look like an upside down “T”. The gauge will be at the top, and the valve will close the horizontal leg between the “T” and the warm-up regulator. With the valve closed and the fuel pump running you will read system pressure. This is usually 5 to 5.5 bar (75 to 80 psi) however most turbocharged cars will be 5.8 to 6.8 bar.