I don't see one. Anyone know of a good video on this topic? I have a Marelli Plex ignition ( I suppose off an '80 or '81) on my "78 spider. It ran awesome 'till I took off the cap and freed up the advance mechanism which was frozen in total advance from neglect. I spray lubed the shaft to get it free and it has never run as well since. I am in fact thinking of freezing it in total advance again to test it to9 see if it will run better like that. Thanks.