This is what I am planning on doing. Tapping the transition signal from the PFC.
I am going to interpose a Solid State Solenoid (SSN) to control the WI valve solenoid. The SSN has a very high impedance at the triggering circuit. I am using it for extra protection, in order not to increase the current through the PFC transistor switch. Others with more practical experience have indicated that it may not be necessary and that the WI valve solenoid could just be wired in parallel to the TCN valves.

 

Sandro while that looks great it also seems complicated as sh|t for me

 

Its really pretty simple. Once you find the correct wire on the ecu its just a matter of wiring it into a solenoid or a relay connected to a solenoid. Its like having a built in rpm switch