The Diesel Power CR Tuning Module installs at the fuel rail pressure sensor. Installation is plug and play and takes about 5 minutes. The CR module works with common rail systems and can "sense" which sensor it is connected to. It only modifies the fuel rail pressure sensor signal to the ECU and no other signals. This “logical thinking” module does not necessarily always modify the signal to increase fuel supply. It can leave the fuel supply at normal levels as well. The fuel supply is increased by increasing the fuel injector pulse width and not by increasing fuel pressure. There is no signal or change to the fuel supply pumps, fuel supply pressures, turbo boost or other operating parameters. The module increases the injector pulse width (or length of time the injector sprays) based on fuel pressure change in the fuel rail. Not every change in fuel pressure triggers an increase of the injector pulse width and the addition of fuel. This is why the Diesel Power Tuning Module is fuel efficient. If you desire, the module is adjustable and can be run at lower settings providing less hp and torque increases. If you prefer to use the module only under certain driving conditions, you can effectively turn the module off by setting it to 0 or remove the unit and installing the supplied bypass module to return to the factory settings. This can be done in the matter of a minute.