MSD 6al wiring

Yeah back in the day I didnt know you couldnt use a regular timing light with an MSD. I would set the timing and it just wouldnt hold steady and run like crap. That was when I just started timing by ear trial and error method. Now I have a MSD light that is made for multiple spark boxes.
Its never a fun experience getting zapped from an MSD. I have felt its wrath on several occasions. Kinda feels like it stops your heart for a brief moment.