I can, but it will light up more than the needle, creating a light spot.
Did not try it in the night time/dark yet, but compared to original lighting, in the daylight, the needle is slightly brighter with the LEDs I used, strangely enough. I also made the needles white instead of the usual red, so should light up even brighter. They look...different, on a black gauge face they are more obvious.
I needed uniform backlighting as I had the idiotic idea of getting custom gauges face done, but that blew up in my face bit time, as they got lost in the mail and now ....
It's far from perfect though, as I would have preffered a PCB with proper auto dash SMD LEDs on it, NOT voltage regulated as I would loose the dimming option, lol, just made to work on a range of 10 V to 16 V (or can voltage regulation be made small enough and still be able to keep the dimming option ?), hot glue it to the white plastic support, hot glue one SMD LED on the transparent plastic near the needle, to light it up properly, connect the wires to the PCB, you get the point. Even replace the warning indicators with SMD LEDs, though they might use different voltage/current and the SMD don't last very long.
Problem is the smaller dials, the fuel level, water temp and clock, the space there prevent doing the same operation, PCB, LED for needles, etc.
I was just looking at the pics you posted of your dash, the ilumination is very uniform with the LEDs you used. Can they be dimmed down a bit, as they look very bright to me and I preffer a more subtle backlight.
Could you post a picture of the 3 smaller gauges to compare with the main ones ?
I plan on getting a new set of gauges, as something happened when I pulled the needles, the rev counter has a small spring which take the needle back to 0, or less than 0 actually. Mine doesn't, no matter how I set it, , it defaults to a random value and it's not even close to acting properly, dropping the needle fast. I have a rev counter from a 2.0 TS to compare.
Speed counter does not have a needle and is closer to normal, but not quite there, lol.
Fuel level indicator moves normal, but very very heavily, like it's submerged, and it should move as fast as the water temp one.
So pretty much I have a working clock and water temp indicator, lol.
When put on the car, powered, the gauges seem to react properly, but when I remove the key....