LED's usually run on anywhere between 2 and 3 volts depending on the LED. Hook em up to full voltage and they won't last but a half a second, sometimes completely blowing apart. If you send the specs for the LED, voltage and current, and what voltage your battery sees at 2000 RPM, I can tell you what resistor to use. Or you can purchase a "LED Driver module" and be done with it. The module provides a steady output voltage to the LEDs over a wide range of vehicle voltage conditions.

 

You Get 2 X 3mm LEDs And A 470 Resistor At 1/8 Watt And It's Fine I Did It An It's Exactly What It Needs

 

Remove Buttons On Steering Wheel On A 2007 F150 XLT? The Cruise Control Buttons I Know How To Remove Air Bag/Horn. I Just Want To Know How To Remove The Cruise Buttons?