Fuel Injector Monitor

The only in car Fuel Injector Monitor available today.

Number of Cylinders

There are three versions for each model of F/I Spy. The version number depends on the number of cylinders in your car's engine.

An F/I Spy Version 4 will have four LEDs, while Version 6 will have six LEDs, and Version 8 will have 8 LEDs.

When you place your order, you must specify the Version you need.