With the early Guzzi V-engines a strap disk is installed in front of the crankshaft, and this disk is manufactured too inaccurately to attach a sensor at this place. However the biggest problem would be the drive belt abrasion, which would fast tie up an optical system.
The most obvious thing is to take up the ignition signals at or in the distributor. The cramped space conditions in the distributor and thereby the tiny light disk and the complicated mechanical structure unfortunately make the retention of the original optic nearly impossible.

The original distributor is modified in such a way that the electronics can be easily fitted in there. In addition the distributor housing must be adapted in such a way that a larger housing can be fastened on it. The distributor modification is contained in the price ( the distributor must be sent to me) .