The brown wire is to run the speedo or tach lights. The white wire with the yellow tape on it it is only used for the Tachometer. Gotta love Mr Honda's design, however look at all the wires and connections that were made on every 350X produced for the minute handfull that have speedo's, let alone fewer still that have the tachometers! With the tack, you also get a small subharness that connects the tach to the ignition coil.
The 85-86R speedo kit runs the light off the rear tailight connectors and Honda gives them a long subharness that runs the length of the trike to the taillight. Guess they didn't want the extra weight/cost on the big racer!
Bruce
'85 ATC350X - "Showgirl" '86 OEM plastics/Fork boots, Rear Axle/Rotor/Hubs, Hondaline Fender stabalizer/extender, Speedo/Tach, Tank cover.
'86 ATC350X - 'Go-Go Girl'
'82 ATC250R - 'California Girl' - Progressive springs F and R, Hondaline HL Guard, Fairing and Speedometer.
'82 ATC250R -'Snow Bunny' Ice Racer, Very Clean, Hondaline Fairing, custom FT tire, will put in the 300R motor
'70 US90 'Ol'Girl" - Aquarius Blue... all original seat and tires. Resto project in the future
'85 ATC250ES-'Workin' Girl' CMP Footguard, Hondaline Mudflaps, Speedo, HL Lens, Block Heater, Work Light, Foot Peg Covers and Cooler Rack
'85 ATC70 - All Original
'84 Yamaha 225DX - Durablue +3" axle, DR motor, New Plastics, Foot, Hand and HL Guards.
'85 Yamahauler - Gun Rack & 'Nerf Bars'
'85 Yamahauler - Nearly together and restored
'83 Suzuki ALT125 - Pieces
'89 Suzuki LT-4WD - Token Golf Cart