Hi John
Looking at my new, as yet to be fitted, housing and checking with the actual M20 installation on my spare donor, the 2 fitted senders (brown upper blue lower) are on the top hose side of the thermostat. The 2 large blanking plugs are on the bottom hose side of the thermostat. As you say, one of these has a much better penetration into the water flow than the other but whether they can be used successfully is another matter. Incidentally the original senders penetrate approx 5mm into the water flow.
Sorton
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