It is unaffected by light, dirt and dampness. The optical switch is fixed to the same plate as were the points, so that speed and vacuum advance remain unchanged. This receives the electronic pulse from the optical switch and using an internal high power Darlington transistor charges the coil. The exact positioning of the chopper determines spark timing, and dwell time is determined either by the width of the chopper or internally to give variable dwell performance. In order to mount the optical switch in exactly the right position in the distributor, specifically engineered mounting plates and brackets have been developed to ensure perfect installations and in the vast majority of cases without permanent modifications.
Installation is also possible without any special tools.
This is for straightforward points replacement using the existing coil offering all around performance and is ideal for all road and classic cars as well as boats. OEM spec, ignition module and optical switch, wiring and mounting screws. High power output transistor gives fast and accurate switching of coil. Fixed dwell gives higher performance than existing coil under all conditions. Fully compatible with the Lumenition engine rev limiters for complete engine protection.