I was able to put a 3/8" universal on a 22mm crows foot and connect solidly to the sensor. It was well tightened. I decided to wiggle some things coolant related in the neighborhood and discovered the heater hose that goes from the brand new hard pipe to the area just under the sensor and heard pressure releasing when I flexed the connector with the wire clip to the hard pipe joint, several times.
A quick look at realoem.com shows two options for that hose. If I contact the hose vendor with the last 7 of the vin number will they be able to define which of the two hoses I need to order? I will do a pressure test next to verify I have leakage from that union.

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,