delphi/packard Weather Pack connectors. I solder all crimps. you can buy em & their bits ... or cut em from from many junkyard harnesses. When done right and with some dielectric grease, they're Very Robust & Reliable. Take a closer look into real race cars. https://www.whiteproducts.com/catalog/WhiteProductsCatalog.pdf In addition to weather pack, Amphenol offers a variety of sturdy connectors.