I realize this is an old post but I tried the Jaycar kit you have mentioned.

For about $300 you can buy and build it. It consists of the new 2007 programmable module, LCD controller and Coil driver.

I have installed it into a Merc M126 V8, as the factory module died and would have cost upwards of 2-$3000 to replace new!
I aslo pre tested in a Mk3 Suzuki swift.

You can also map the ignition against Manifold pressure.

Ideally you would need a dyno or second person to assist with the mapping.

Cheers,

Morgan