Hi guys, sorry to bump this topic. I just ran into that very same issue 5 minutes ago and found the solution.
For the gauges in the Zephyr to display properly, it is mandatory to download and install the "RFN Carrier Gauge" from this page: http://royalefrenchnavy.restauravia.fr/RFN-Creations.htm
(scroll down).
Now my gauges in the Zephyr are finally diplaying properly, no more black holes