You can try the FSDT FS BA F/A-18C v16.1 .
Fantastic plane, and as far as I know, the HUD is an upgraded version of Jivko Rusev's HUD for the F/A-18, F-14, and T-45, along with several others. I am pretty sure it will work in other planes, or just go with Jivko's HUD as a stand-alone.
You can down load it at Flightsim, Avsim, etc. You can get the FSX BA Hornet from the FSDT forums. I can post the link if you like. Once it's downloaded, you can install it into a temp folder and copy the HUD stuff over to where you need it. You will need the Hornet.dll, and the .NET Redistributable v 2015 (I think it is) IIrC. The plane's auto installer will install it for you if you let it.
Jivko's HUD doesn't need the extra files to function correctly. It's a purely stand alone gauge, but not as sophisticated. Just search the library(s) for Jivko Rusev, and it'll pop up eventually.
I am pretty sure both of those will work in in v4, but hey, I've been wrong before
Jivko's HUD is pretty old, so I can't swear it will work in v4, but I know of no reason it wouldn't...
Hope this helps
Pat☺