I always solder all of my connections. I was an electronics technician for all of my work life, and I personally don't trust any connection that is not soldered. Good soldered connections are trouble free, and they tend to be that way forever.
Mike Burns 1940 Chev 1/2 ton 1953 Chev 1/2 ton 1950 Studebaker Starlight Coupe 1947 Indian Chief 1943 Indian 741