A rough patch I made that allows using Glowing Tubes and Glowing letters with PM's HD Pip-Boy 2500.

Installation:
1. Install A Familiar Friend - Pip-Boy 2500 - Handheld Pipboy 
2. Install PM's HD Pip-Boy 2500 - Minimod (doesn't matter which option - the patch changes it to Classic)
3. Download but not install* Pip-Boy 2500A 'Glowing Tubes Edition' - The Arm Mounted Pipboy 2500
4. Install Pip-boy 2500 - glowing letters 
In FOMOD choose Glowing tubes edition - glowing letters and logo
5. Download and install both files from the Files tab

Obviously, if you don't want glowing letters, skip step 4 and don't install Glowing letters patch; if you don't want glowing tubes, skip step 3 and don't install Glowing Tubes patch.

*The way I made this patch, you don't actually need to (and shouldn't, it would probably break your game with this patch) install Pip-Boy 2500A 'Glowing Tubes Edition' - The Arm Mounted Pipboy 2500, but you should still download and endorse it. I tried to package the files so that there would be dependencies on all of the original files, but as there isn't anything in IrregularJohn85's mod aside from textures the patch replaces, I couldn't come up with a solution.

As I made this patch for personal use, the patch uses CLASSIC option from PM's HD Pip-Boy 2500 - Minimod. It doesn't matter whichever one you download, it will be replaced with Classic one. Same goes for Pip-Boy 2500A 'Glowing Tubes Edition' - The Arm Mounted Pipboy 2500 - the patch only contains 100% brightness option, and for Pip-boy 2500 - glowing letters - the patch is only for Glowing tubes edition - glowing letters and logo option (though I tested it a little and it seems to work OK without glowing tubes). 
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As I have 0 experience in GIMP and modding overall, if you look into the .dds files, you'll see it's a pretty low quality patch, but it works OK for me.
Also, there's two additional .dds files in  Pip-Boy 2500A 'Glowing Tubes Edition' - The Arm Mounted Pipboy 2500 that I didn't use for this patch, and thus they're left unused. One reason is that it works fine without me patching them, another is that I have no idea what they are for.

As I didn't ask for permission from any of the modders, if they would want me to delete the patch, I will.

Credits:
EdisLeado - for A Familiar Friend - Pip-Boy 2500 - Handheld Pipboy 
pommymax - for PM's HD Pip-Boy 2500 - Minimod
IrregularJohn85 - for Pip-Boy 2500A 'Glowing Tubes Edition' - The Arm Mounted Pipboy 2500
DryBones12 - for Pip-boy 2500 - glowing letters