Car Electrical Wire Terminal 1/1.5/1.8/2.2/2.8/3.5mm Auto Electric Connector Non-Insulated Plug Removal Male Female Crimp Pins (Color Name : 290PCS Sample)

Try to search for single pole cable connector, they are popular among cars, and 1,8 mm size also exists. Example: https://www.amazon.com/Electrical-Terminal-Electric-Connector-Non-Insulated/dp/B09TDCB41K Of course, this solution is for prototyping only.