Instrument Voltage Regulator for 65 Dart

Last year I took out my cluster to replace the broken IVR with one I bought here on FABO. It didn't work (the fuel and temp gauges still don't work) so I saw this on Classic Industries. It says it'll work for a 65 dart but that it's for cars with a "push in" limiter. Any ideas on making it work? MB2000B - 1965-74 AMC, Dodge, Plymouth; Gauge Cluster Voltage Limiter; Various Applications
RTE Voltage Limiter install for 65 Dart