As I have posted already: The CV 990 had the same Sperry HZ-4 Attitude Director indicator as the Caravelle and it could navigate by Bendix CPA-12 Doppler-Radar navigation-computer.
So its a play with elements already created in FS 9. Gaurants Caravelle ADI and the Dopplernavigation NAS from the Tu 134. The last one looks differently but has a similar functionality.
So it looks and works like that:
Kind regards
Walter
P.S.: One needs the electric subpanel of the Caravelle!
And sorry my picture upload doesnt work today, so its an attachment.
In the 70s various airlines equipped their 707s etc with the Bendix instrument: