NMEA 2000 is a very neat way to link your electronics and, if you have them, electronic engine controls. (Disclosure: I am a former member of NMEA). There is one long cable with terminations on each end, and everything Tees from it, including power. You can mount a Multiport box at each steering station, to handle the stuff there, and connect each box with 1 cable. Sensors are wired by daisy-chaining them, which takes less wire than wiring each to a central terminal block.
There are a couple of different sizes (mini, micro) of cables, for different needs.
This is not cheap, and requires NMEA 2000-compatible components, which in my case would mean "all new".
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida