I bought a hose rigging kit for 3800Php (about 60 quid) from the Mercury dealer: 32-825191A03, about 1.5m length of 60mm dia corrugated hose, it fits the cable and hose rubber connection inlet on the outboards. I use this for gear & throttle cables, fuel and electrical cables direct to the engine.
Also bought 32mm dia hose on Amazon, for my other electrical cables for lighting, bilge pump and sounder cables -
Sealproof Kinkproof 1-1/4 Dia Waterfall, Pond Tubing & Aquarium Hose, 1-1/4-Inch ID, 20 FT, Black, Corrugated, Made in USA
Sold by: American Synergy
Hope this helps.