So I have installed some aftermarket gauges in my 78 and plan to swap the rest of the stock ones for similar era Celica's that I'm gonna white face to visually match the new ones. The new ones have 7 preprogrammed LED colors. It uses a single SMD style RGB LED. In simple terms, it can do red/green/blue at the same time. And vary the amount of each to make any color. I am still researching the logistics and costs, but I thought about making a universal harness kit that can be used in any car or truck. Should be a pretty simple install. Mount the controller, which has 3 knobs. I will reverse mount mine so its just 3 knobs sticking out of the dash. And then replace the bulb sockets in the stock gauges with these. Now, on some cars/trucks they have a layer of color built into the gauge cluster itself that has to be removed for best results. I could probably convert housings for people if they wanted to send them my way. Anyways, the basic concept is instead of greenish stock lights, you could have any color you want by adjusting some knobs to the colors you like. Wiring would be a matter or plug and play the bulbs, and wire 12 volts to the controller from your gauge light circuit. Stock dimmer should work as well. If that doesn't play true in testing, I can supply one that goes with the box. Is there any interest in this to people? The controller is $25 my cost, and a stock setup should require about 10-12 LEDs, which is about $10 my cost. So I'm roughing cost of the kit to be like $50-60 shipped in the lower 48. Since it would easily fit in the new USPS "if it fits" boxes. Thanks guys.
It wouldn't be much of a mark up if any is why. its more to get the skills built up and fund the continued orders to keep making them. Would work well on the later model trucks with the white face gauge kits out there too. I am working on all the wiring of hacking into the new gauges I installed to override the control to the LED from their circuit to my own.