When many of the Gen II's came from the factory, the owners manual was placed in the pouch behind the passenger's seat. Might be worth a look. You also might find a pencil sized metal hook, that was used to remove the center hub caps.
Yellow light was a government mandated upshift indicator, to let you know when to shift into the next higher gear for fuel economy. In the Viper this often conflicted with the also mandated 2nd-4th gear skip shift. If you shift when the yellow light first goes on, you will also trigger the annoying skip shift. Most of us just ignore the little yellow light, and wind it out just a bit to avoid the skip shift.
A really cool item, is that the little yellow light serves a dual purpose. When approaching the rev limit, it turns red, and lets you know you are close to the rev limiter, and should shift up to the next gear. First car I ever drove that had a factory stock shift light.
As far as your dash dimmer controller, if you turn it all the way down until it clicks, your interior lights will not then come on when you open your doors. Kinda stealth mode.
Nice to know if you are working on your car, or just have the door open to listen to the radio while waxing it, so your battery will not be drained by the interior lights staying on for hours.
You will also see a tiny red blinking light on the backside of your rear view mirror. This will blink fast or slow to notify you of the status of your alarm system.
Vipers are really pretty clever vehicles. Lots of extra thought went into their design.