As Phil said, this is unfortunately a common problem on most RTs. Like many, we disconnected our analogue gauges & they both show up now on the center LCD screen & they both seem much more stable & accurate. If you'd like to do it also, its easy. Just remove the 4 bolts that hold the dash bezel in place, disconnect both wire sets to the analogue gauges, push the loose wires back into the dash area & replace your dash bezel with the 4 bolts. Once you turn the Spyder back on, your fuel will show up on the right side of the LCD screen & it toggles with your audio volume control. Your temp. gauge will show on the left side of the LCD display & it toggles with the push button rear suspension control.
I personally like the digital read-outs better & it gave me room to add the cup-holder & LCD rear-view camera system to keep an eye on Teddy.
Granted, BRP has some work to do on this issue & I do believe they actually have a next-gen gauge replacement out, tho I'd think they'd have them on newer units from the factory, but what do I know:lecturef_smilie: Hope u find a suitable solution that works for you.