At 06:55 PM 1/9/2014, JRodgers wrote:
>Ok - that is the supply side voltage to the coil?  And the tach wire
>attached to the same pin by way of a blade connection. So how is the
>pulse generated  for the tach to pick up. ie - how does that work, anyhow.

John, the tach sender wire connects to the negative side of the coil.

There are four wires on the coil, which has two terminals, plus and
minus (each one provided with two spade connectors).  The plus side
carries the 15 circuit coming from the ignition switch, and has
another wire that carries the 15 circuit to supply something else in
the engine room, forget what.

The minus side carries the driver wire coming from the ECU (or from
the ignition driver module on the 1.9l setup), and the tach sender wire.

If you hook the tach wire to the positive side it's guaranteed not to work.

Yrs,
d