I don't have a factory tach, so I marked that part out. If this works, I can handle it.
Easier than that. Get a 6" bullet connector extension (trailer parts) and spice into that on the bench. Go under and simply plug the tee you made into the bullet connection, hopefully without pulling the seat.
Not pushing for other reasons, but only to report that most installing the P-II typically report better starting, idle, and tip-in throttle response, versus P-I. No scientific numbers here, just customer satisfaction comments in-general. This is likely due to the substantially increased spark energy (fat and longer duration spark), on-top of marginal original ignition condition.
While it also requires specific tuning for results, the P-II can also ignite lean mixtures better than either P-I or P-III, making power
plus economy more achievable. In testing, we found high-energy sparks can fully ignite 1/2 to 1 AFR leaner than stock or CDI at highway cruise. With diligent tuning, this has made a huge difference in unexpected ways, such as saving almost 300 pounds of fuel weight in offshore boat racing from Ft. Lauderdale to Bimini, or my 3/4-ton truck increasing from 9.5 to 13 MPG, a 38% increase. An exception, but I'm proud of that one.
