Okay.

Scratch my previous post!!!

After copying all the files for the CS C-130 X-perience from FSX (actually FSX-SE) to P3Dv4 (including the FSX\Captain_Sim\C130 folder, and the effects files for the C-130X from the FSX\effects, and FSX\effects\texture folders), I now have most of them working properly, and all I did was copy the panel.cfg from the P3Dv4\SimObjects\Airplanes\C-130\panel folder, into the panel folders of the following folders in the P3Dv4\SimObjects\Aircraft folders:

CS_C130
CS_EX1_C130
CS_EX1_CL130
CS_EX2_C130
CS_EX2_C133
CS_EX2_LC130


And then I copied the panel.cfg from the P3Dv4\SimObjects\Airplanes\C-130\panel.eicas folders into the the panel.g folders folders of the following folders in the P3Dv4\SimObjects\Aircraft folders:

CS_C130
CS_EX1_C130
CS_EX1_CL130
CS_EX2_C130
CS_EX2_C133
CS_EX2_LC130

Now, there are a couple of extra gauges in the KC-130, and AC-130, so I copied the panel.cfgKC-130\panel folder into the CS_EX1_KC130\panel folder, and the panel.cfg from the AC-130\panel into the CS_EX2_AC130\panel folder.
Make sure that both of these aircraft are NOT set to use the EICAS panel and gauges (using the ACE in FSX/FSX-SE) BEFORE you copy them over to P3Dv4!
If I work out how to get the EICAS panel working in the AC-130 and KC-130, I'll let you know.

Note. I haven't fully tested them yet, but the fact that they look fine (no missing parts on the models, and textures look fully intact), and all the gauges are visible in the VC (2D gauges as well), they SHOULD work!