The tach signal was fairly easy. I wanted my factory tach functional. I ended up using the ignitor and coil from the 22re to build my own tach signal amplifier. I built a pickup on the vw harmonic by making two notches on the backside with a generic crank sensor. It took a long time to figure out how to get it to work until I realized that the coil itself is needed to amplify the signal. I can give you more details when the time comes.