I am installing a new O2 sensor in the 4ksq. Should I just crimp it with some H20 proof connectors or do I need to solder it? I am mostly concerned about degradation of the connection over time and concerned about added resistance. TIA, Shayne P. 1972 MB 280 SEL 1984 4ksq 1987 4ks 1991 v8q5 1991 200q Sedan 1992 S4 Parting: 1972 Mercedes Benz 280 SE 4.5