Fuel gauge fault temp gauge fault

SOURCE: wireing tempature gauge

Outside temp sensor located at inner fairing, it is tied to left fairing frame just above cigarette lighter.
On OEM parts,
Air Temp Gauge pin#1 = Orange +12 Volt
Air Temp Gauge pin#2 = Black - ground
Air Temp Gauge pin#3 = Air Temp sensor pin#1

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SOURCE: my rev counter, speedo, fuel gauge and temp gauge

try to check yor meter conection at the rear of your meter.there is a loose connection due to vibration

SOURCE: cbr 125 rw 7 instrument panel

Sounds like you have a ground fault. I once had a car with a faulty ground wire on the headlight, when I put high beam on the speedo would jump to 170km/h and the indicators would glow dimly. Sure sounds like a similar ground fault to me, check all the ground straps, from the headlight or anywhere else you can think of.

SOURCE: where should the temp gauge read on a vtr

normal op temp should hover between 150-180. sounds high huh. it will stay close to 150 most of the time but look out for more than 180

SOURCE: 1977 Honda GL1000 Goldwing. I replaced the water

I have a few 1977 GL-1000 bikes.
I thought one was overheating but it turned out that the 9 volt regulator was fried and was putting 12 volts to the temperature gauge. Temperature was really OK. The fan switch is probably not lying