[78_220]

https://www.vanguardpower.com/na/en_us/support/faqs/browse/electrical-schematic-wiring-diagrams.html

 

[78_220]

I recently purchased a 2" tachometer that is settable for 1 to 10 cylinder.
The instructions say to connect the tach signal wire to the coil.
At Briggs site I found the following wiring diagram, View attachment 119767
My though would be connect to the primary side of the ignition coil?
Also, if this is the correct wiring diagram and both plus are connected to the secondary side of the coil,then do both plugs fire at the same time or on each revolution?
thanks Bill

Hi Bill, I think some more info will be needed to help you out with the tach install. I'd suggest posting the tachometer info (website/hyperlink) from where it was purchased.

In regards to the coil, a vanguard engine uses magneto ignition, so the only primary wire should be the kill switch lead that goes back to your ignition switch. So when you shut the key off the primary winding in the coil is grounded. With the primary winding grounded voltage cannot be induced into the secondary coil winding to fire the spark plugs.

The info provided so far suggests you may have a tachometer for a battery ignition system, as those will monitor primary switching(on/off) at a coil terminal to determine RPM. Most common magneto ignition tachometers are an induction type. These will use a lead that is wrapped around the outside of the spark plug wire to detect secondary firing pulses to determine RPM.

Until you sort out what you have tachometer wise I would not hook it to the coil yet.