Fuel injector interface device and method of use

A fuel injector interface device, comprising:

• a controller;
• a pair of input leads each having a first end that is configured to engage a pressure sensor outputting a digital signal, and a second end that is communicatively linked to the controller;
• a pair of output leads each having a first end that is configured to engage directly with a display device and a second end that is communicatively linked to the controller;
• and
• an auxiliary lead having a first end that is configured to engage directly with the display device and a second end that is communicatively linked to a control line of a fuel injector;
• wherein the display device is configured to display a first signal received from the control line of the fuel injector through the auxiliary lead;
• wherein the display device is configured to display a second signal received from one of the pair of output leads, wherein the second signal is based on a reference signal received from the pressure sensor;
• wherein the display device is configured to receive a third signal from another one of the pair of output leads, wherein the third signal is based on a low reference signal received from the pressure sensor.