Mounts on a flat surface and use 2 screw to secure the –400 meter as show in the picture.

Clip the sensor to spark plug wire and screw the ground terminal to any appropriate metal part of the engines chassis

 

Screws at the left and right ears for –500 meter

ARM127MK2-400 Mounted as shown in the picture

Sensor is mounted as shown.

Secured with a tamper proof security lock.