Getting everything ready to tackle the soldering and I noticed a slight difference between the image tonyw posted above and the diagram I found on the Tonerider website. In the Tonerider diagram they show the cap soldered to the middle leg of the tone pot and the case of the tone pot. In the diagram above it shows the cap soldered between the middle leg of the tone pot and the case of the volume pot.
My electronics knowledge is pretty limited but I think either of these should be fine since the cases all link to the ground going to the output jack. The factory wiring has the cap all on the tone pot but it's pretty scrunched up around that pot. Might give a bit more room if I went between the pots.