So you take the LED strip, wrap it around the cup, cut to fit exactly on the line, peel the adhesive and stick to the cup. Cut off a 1/4 inch or so of the silicone waterproofing on the end you want the connector on so your contacts are exposed and solder your wire to them, cover with heatshrink. Cut your polyethylene tubing to fit (this takes several attempts to get it perfect when fitting over the LED strip and solder connection) then connect the ends with a metal dowel pin to form the circle and hold it tight (may want to glue them but I haven't had any problems with them popping out when cut perfectly). Plug your connectors into the your splitters so you don't have to run a wire all the way back to the dash for each one, then run extension connectors from your splitter on each side all the way to your dash, tie them in with another splitter, and connect to a dash switch.
I bought the stock switch from my dealer, then borrowed the existing wiring for my underwater lights that's already hanging under the dash and got my power and ground and tied my cables into that and it worked perfectly.
LED Strip
https://www.amazon.com/FAVOLCANO-Densit ... olcano+ledPolyethylene tubing - Get 20-25ft in case you screw up, you use about 12" per cupholder.
https://www.lowes.com/pd/B-K-3-8-in-x-2 ... 1000116037Cupholders
https://www.amazon.com/gp/product/B01LW ... UTF8&psc=11-4 Splitter, 2 per side (run second splitter off 4th cable on first splitter so you have at least 6 connections per side), one for bow, then one at dash to connect port, starboard and bow cables
https://www.superbrightleds.com/moreinf ... riteReviewConnector to solder to LED strip and connect to splitter (1 Male per cupholder - might want to trim to fit or you'll be zip-tying a lot)
https://www.superbrightleds.com/moreinf ... riteReviewExtension cable to run from each side's splitter back to dash (one 9ft and a 3ft for the port side, two 3ft for the starboard side, one 3 ft to reach from port bow cup holders to starboard side bow splitter.
https://www.superbrightleds.com/moreinf ... riteReviewFemale connector to go from your dash switch to your dash splitter
https://www.superbrightleds.com/moreinf ... riteReview3/4" metal dowel pins (found at Ace Hardware .35c each) to connect tube ends to form cupholder ring, 1 per
Solder/solder iron
1/2" wide heat shrink
I learned this the hard way but the external cupholder LED tubes I made wouldn't fit in the bow because there's zero space between the vinyl on the speaker panel and the cupholders so I opted for recessed LEDs I found below. I then later found out the cutouts weren't a perfect circle and the stainless steel ones I bought are a hair too big so I'm going to need to get a router to cutout more fiberglass, but these will work with the above cabling, just get a waterproof butt connector to connect the wires to your LC2-M connectors to plug into the splitter.
https://www.amazon.com/Pieces-Stainless ... 4SENEKVAQM