We need to know the Ohm operating range for the Dolphin and Royal Cockpit gauges.
If they are the same, your sending unit will be fine. If they are different, you will need a new sending unit to match the Dolphin gauge.
Standard VW is 73 Ohm Empty/ 10 Ohm Full
Paul Mossberg
Former Owner of a 1981 Classic Roadsters Ltd. Duchess (VW)
2005 Intermeccanica Roadster
If you own a TDr and are not in the Registry, please go to https://tdreplica.com/forums/topic/mg-td-replica-registry/ and register (you need to copy and paste the link)