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Ok so two questions...
1. I gather I lose the ability for immersion as now using that pocket
2. Will I be wiring to vr66 for cylinder stat AND NTC?
1. Depending how many 'spare' pockets there are, or if you can squeeze the VR10 alongside other phials.
2. Just the VR10 to the NTC plug of the VR66, then the live (brown) from the HW on plug of the VR66 is wired through the original cylinder/OH stat and then onto the MV. These stats can then interrupt the live supply to the MV in an OH situation and the valve will spring return shut. In practice you could just use the OH section of the cylinder stat, but some manufacturers combine this into one unit with the temperature control for easier wiring, so I don't know what you've got. Remember the person doing this MUST be G3 registered to notify the installation.