Actually had to go out tonight and switched interior to Night/Stealth Mode. While in this mode I accessed the Customization Menu, and sure enough, even while in Night/Stealth Mode, there is no option anywhere to turn the light on for the tachometer. Either I have old software in my DIC or this option is only accessible with the V8 engine. The Temp, Fuel, and Tach gauges did correctly go "dead" while in Night/Stealth Mode; however, I am curious to know for those who do have the option to turn on the light for the Tach, if the Tach remains dead or does it work normally when the Tach light is turned on...???