I am making an electronic tachometer for the Wenco bike, same size as the Smiths gauge so I can use the rubber mounting boot. It will have a programmable RPM limit light (flash then solid, separately settable), RGB oil pressure and temperature lights. There are two ways I can incorporate the RPM light, a jewel in the upper centre between the needle and number scale or around the rim with the lighting LEDs.
The jewel would focus the light more directly at the driver if the gauge were not laid flat with the top triple clamp.
The other two lights are at the bottom between the max and min numbers.
Since I plan to make these available in the future, which would arrangement be more appealing?
I have not decided on the best interface for programming the light but to keep things water tight, probably a USB port that plugs into a PC.