360 pressure sender unit VDO alternative

Planning on replacing my pressure sender unit.
I’ve read of an alternative using “non Ferrari “ parts with identical spec, see below, found on egauges.com:

1 x VDO 360-025
1x R7965 M18 X 1.5 male x 1/8 NPT

Question to whomever has gone that route:
-What was the torque spec when installing the adapter to the sender unit?
Where can you get a copper crush washer for this set up?


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