Are you using the original solderless wiring? Are you starting from scratch? Are just wanting to install the Shadow pot into an already working guitar? If you are working on an already working guitar Please give the model number, if EMG equipped, So I know where and what we have to work with. But this should be a straight up fairly easy setup. The Shadow pot just replaces the normal volume pot. Off to work, but will be back with you.
Ok Im working on your diagram. Did you leave wiring on the three way switch or un-do it? You will need to use the 25 Ohm tone control not the old 5oo Ohm. Do you have the EMG kit all the wiring that comes with it or just the pickups. Have you decided where to put the battery, is that what you mean about not much room in the cavity? Are you ok with some soldering, if needed?
Ok. here goes, this is a close as I can come with what you have told me you have. The Yellow wiring I added are really white wires in the EMG kit, the black lines are the ground wiring on the (A) terminal which is the kill circuit. The Kill switch is hard to see but if you have the instructions that came with it you should understand. The Loop side is the (F) terminal. See what you think. If you want it better I can e-mail it to you. Send your e-mail add. 
Part of the diagram is cut off, right click it and save as, or right click and view image.
Just redid the battery for 18 v. I think you understand anyway, but if you need the corrected version let me know.
No caps on the volume, should be one on the tone. Thought that built in the Tone control pot from EMG. Will recheck and repost. Does the kill part work?
There is no caps on the volume. My e-mail is not working cant send a new drawing I am posting the revised one here, right click and save as. Add a wire from the black on the Shadow kill switch to the open post on the kill switch pot. it will be a loop just like on the output white wires. That should fix it. 
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Hello there,
Here are wiring diagrams:
or you can try out
http://www.lacemusic.com/wiring/pdf/5.pdf
Hope this helped.
All the best.
Elect_Comp
Hello! Here is a link to the PDF Installation guide with wiring diagram for a kill pot...Used as either tone or volume control...Guru..............Saailer
http://www.shadow-electronics.com/doc/pro_pdf1/en-GB/Manual_SH_124_international.pdf
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
Take a look at this diagram and see if this helps you at all.
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I
removed the old passive Ibanez pickups from RG 2EX2. I installed the EMG 81 and
60 but haven't rewired it yet. I have a 3 way in line switch. The killpot (25kOhms) will
replace the volume pot. I'm trying to save space since the control cavity
barely have space so only the parts for solderless kit are used, except volume,
and bus. I can use the Tone solderless pot but if it would be easier to just
use the old one then it's alright. I haven't removed anything from the tone pot
even the capacitor. Thank you for your time. :)
I left the wiring on the three way switch which includes ground, output, bridge, neck. Yes, I have all the wiring that came with it. I have placement on the battery, i tested it out and I was able to fit 2batts since im going for an 18v mod. Battery placement is manageable. Yessir, I have a soldering kit ready to use.
Looks good. Ill test it out. Here's my email address : [email protected]
What happened in the end was, the killpot became a Tone control .. so I have 2 tone controls with no master volume. I don't know if that tiny blotch in the diagram is a Capacitor, the middle input in the kill pot.
Excellent fix. Excellent service. Thank you very much for bearing with this problem! I appreciate your patience.
The service Mcneb gave was highly satisfactory. I give him 5 stars for the solution. Took the time to work out the diagram and work with me on it. Thank you very much.
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