The wiring harness for the 1916 - 1918 Chevrolet 490 is a little different from that of the 1922. For the 1916 - 1918 cars the harness has a two wire headlight connector where the 1922 has a one wire headlight connector. Also the switch panel for 1916 -1918 is a four button panel.
If you need a wiring harness, you may want to contact YnZ Yesterdays Parts to see if they can help. They do list different year model harnesses on the web site.
www.ynzyesterdaysparts.comThere may be other suppliers available out there.