Comparison Photos: 280z on left 240z on right Front (note 280z screw hole) Bottom Top Back Back Harness (Note white current loop on 240z and red voltage pickup wire on 280z) 280z back (Green is 12V and black is ground) 280z and 240z connector comparison. (Note the different locations for Gnd and +12V. It is neat to see the location for the tach signal input is in the same part of the can...clever engineering and evolution).