coil earths and rotational idle

[orrinmcdrift]

Hey guys
I have been playing around trying to find a electrical fault in my premium loom and have noticed the earths of the coils are actually wired back to the sensor earth (black/white cable) ?
Car has been running fine up until now but im just checking if you think this might be effecting the earths somehow? Or should it change it over to a chassis earth?

Secondly while iv got all the wiring out i want to be able to manually switch the rotational idle one and off as needed. What is the easiest way to do this?

[duz10s+gtr]

I'm also interested in the rotational idle piece however I want to engage it?

[HaltechMatthew]

Never wire coil earths to the ECU. They go the cylinder head as the return path for the spark energy.