We have two MG-1P using OAR, both hadl liquid interference inside the radar body.
Its cable connection is not tight, and the washer between the cable and the body is not proper.
This is a general problem and it get liquid inside.
How do I make it IP67?

We had this problem too, the solution we found was to apply a specific Silicone Grease for sealing, applying it to all radar seals, including the cable connection. 100% solved.