megane dci compression test question.

I want to carry out a compression test on my 1.9 dci prior to removing the head to determine which piston has low compression.



I have done loads of compression tests on petrol engines but not on a dci.



I have an adapter to fit the glow plug hole and will remove all four glow plugs and unplug the fuel regulator on the pump. Do I need to remove the injector electrical conections as well.



The main question is regarding turning the engine over as all prior cars I have tested use an ignition key. Once I start the engine cranking with the starter button how do I stop it, do I just push the button again.



Thanks for any input.