Different boat, but the problem with bringing new wiring up to that pod is similar to any boat.
One our boat we have the AP drive wire led up thru one leg of the guard and the plotter/radar wiring thru the other side. Both required drilling and chamfering an exit hole near the devices and then feeding the wiring up from underneath the cockpit thru the mounting SS socket feet.
Tedious work; moderate swearing involved.
Getting at the underside is difficult on many boats (relatively easy on ours) and first getting a small 'fish' wire thru, and then using that to pull the device wiring thru..... takes some time and it sometimes helps to use some electrician's 'blue lube' on the wired to ease the passage (called "smurf juice" in the trade).
If a PO has led wiring up thru the central part where it gets abraded by the cable/chains, get it out of there. The OEM had enough problems just keeping the small-diameter twisted compass light wiring from getting in the way!
Good luck and post up some pix to help others better visualize the problems.
Apropos of whatever, if we all converted our boats back to tiller steering and tossed out those "boat show marketing oriented" steering wheels all this would be a LOT simpler......