Timing Light With Tachometer

Why do you have foil wrapped around your light?
I answered for Mike a few weeks back.
He is an Electronic Technician still where I was also in the 1980s and early 1990s before becoming hired as A Mechanic.
Magnetos Deliver the Highest Joule Energy output of any Ignition system still.
Also RFI Radiation is generated Its True Alternating current a Magneto delivers to the spark plugs not DC Direct current like all other Ignition systems.

I made my own Farady Can wrapping the Snap On Timing light with tinfoil.
Farady Cans used by Nuclear Field also and by US Military for Atomic isotopes when huge amounts present and for Doomsday Atomic Bombs dropped.
Shuts down all MOSFET and TTL Electronics and computers.
Even modern Race Holley EFI Systems have issues with Electromagnetic radiation.
Known to latch up the computer and next thing that often happens is the engine blows up on the Race Car.
 
This is the only info I could find. By the way, I tested the light, it just flashes “Snap On” on the screen. Before you say anything - Yes, I did connect it correctly even though my battery is trunk mounted I used one lead to a good ground and the other to the power side of the coil.0193EBCF-05D3-4E1A-AF08-DB2409D6C4C4.jpeg
 
This is the only info I could find. By the way, I tested the light, it just flashes “Snap On” on the screen. Before you say anything - Yes, I did connect it correctly even though my battery is trunk mounted I used one lead to a good ground and the other to the power side of the coil.View attachment 15880
Connect on the power output of the alternator. Connect the Pickup to the #1 spark plug wire.
Start the engine on the Catalina.
 
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