[bestclimb]

When running on both pots you could wire the O2 sensors parallel, the ECU would see an average voltage. However If the ECU uses 2 O2 channels this would be unnecessary.

have a relay between the deactivated cylinder's O2 sensor and the ECU that opens when you activate your deactivater. If 2 channel O2 another relay would close between running O2 sensor and deactivated O2 sensor input on the ECU this would/may/could/might/possibly/perhaps fool the ECU into thinking all's well.

Also then you activate your deactivator it sends power to a solenoid on the throttle for the deactivated jug.

As far as switching a flip flop and counter triggered by induction from the spark plug wires.

The suggestions made in this post are made with a level of understanding slightly above "magic crafted by robotic wizards" on how an ECU works. I don't know if the ECU would be fooled, or if the resulting amperage drop would cause the ECU to not see the working O2 sensor, or if the double amperage of two O2 sensors wired parallel would be too much for your ECU

How you going to solve the valve issue. I have visions of a solenoid in the push rod or on the lifter that shortens it.