Not sure if you have simiar repair facility in the USA for vintage/classic instruments but another recommendation in the UK is Speedograph Richfield. They clearly work with RVI/RVC instruments and offer exchange as link below, which should reduce downtime if they have suitable in stock.

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Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone