The cluster is grounded to the dash frame which is grounded to the car body. red amp wire goes on left stud ( A1 ) looking at the diagram. the gauge will read backward if hooked up wrong.

Last edited by yella71; 01/04/16 11:23 AM.
71 challenger convertable, 64 sport fury 383 ci with factory air 99 sebring convertable 89 CTD pup