The tach signal looks like this.

.......|-----|......
.......|......|......
 ____|      |____

Zero to 12 volts. One square wave pulse per revolution.

The Lamar Ignition will give a spark slowly turning the engine over by hand.
This can be done with the water pump pulley.

VERY,, VERY IMPORTANT TO NOT CONNECT ANY OF THE SPARK PLUGS WHEN
DOING THIS AS THE ENGINE MAY START.!!!!! :)

It is also easy to start the engine by the hand propping in aircraft installations.

 Normally this green wire is bent out of the way but it is a built in timing
light and system tester. Each device has one. It is a quick way to test the
units when they are manufactured.

The timing can be adjusted by twisting the brass rod.
You use the Mark I eyeball to align Rotor 1 optical trigger with the timing
pointer.

Paul Lamar

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