Well that's a bugger! gotta be a paid member to view the instructions!!!
Locate the spark plug and spark plug wire beneath the engine cover. This is where the tachometer's reader wire will be installed.
Wrap the tachometer's reader wire around the spark plug wire, near where it attaches to the spark plug boot. Use one zip tie near the boot, and one at the end of the coil to secure the reader wire to the spark plug wire.
Remove a bolt from the engine block. Set the ground wire of the tachometer underneath the bolt head and tighten the bolt down on top of it. This will ground the tachometer.
so can anyone help me figure out how i would rig this on my racing mower engine? i know were to wire it and stuff but cant figure out how many pulses it has.