Local dealer is correct but didn't cover everything. In order to get the thermometer to work you'll also need to buy an ambient temperature sensor which is about $30 more.
That said there was someone on here that got the temp display to work just with the temp sensor. I'm on mobile so search doesn't work well so try searching the forum for ambient.
Retired USAF, IYAAYAS!
2008 V-Star 1100 Custom Bobber project
2011 Crimson XR with Forged Highway Bars / Hard Bags / Passenger Backrest, Ness parts including Smooth Layback Plate Frame/Mount / Rad 3 Mirror / deep cut grips / drivers floorboards /shifter peg / brake peg / passenger pegs. Witchdoctor black rack, Lloydz filter / timing wheel / VFC III, 7Jurock windshield, Drag Specialties seat.