A/F Knock Amp.

Two A/F sensors can be used together. (Bosch A/F sensor is included.)
1 main unit can measure 2 different A/F values of the V-bank engine or multi-cylinder engine using 2 sensors.
The product consists of 2 units, a color LCD display/controller and amplifier. The design style is consistent with other HKS electrical parts such as EVC, etc.