The shunt or wiring to it could fail no matter where it is located. The remote shunt and connections to are somewhere besides in the dash/gauge. The remote shunt gauge has wires so small that the 76 a-body gauge is wired through the printed circuit board like other gauges. Its only sensing the current through the shunt. So 76 circuit board and wiring harness are 1 year only also ( unless the 77 Spanish Dart is the same, I don't know ).