Dim Dash Lights

Forget the generic no-name garbage you can buy all over eBay. Spend the money to buy legitimate bulbs so you can do the job once and never have to do it again.

Now there are finally(!) some(!) legitimate and good-quality LED retrofits: these (2-pack) and these (1-pack).

Take note, LED means Light Emitting Diode. A diode passes current in only one direction, not both like a filament. So it matters which way round the bulb is installed in the socket (or the socket in the circuit board). If the LED is installed backwards, it won't light when it should. If there are other LEDs in the system (as there are in the dashboard) then just one backwards LED can create weird new paths for electric current that shouldn't be there, causing a no-light or no-light-when-supposed-to or light-when-not-supposed-to situation.

So, fashion a jumper to ground the cluster properly (when installed in the dashboard it grounds via dashboard metal). Install one LED bulb/socket assembly. Try it out to see if it works correctly. If it doesn't, remove it, turn the bulb or the socket (not both!) 180°, and reinstall it so it works. Then move on to the next one: install one more LED bulb/socket assembly and try it out. Proceed this way until all the bulbs are installed and working.