Has anyone replaced the low fuel light and or low oil light with LED's? I've done mine but now they just stay on constantly.
I'd guess there is still nominal voltage in those circuits even when the lights aren't supposed to be on. The LEDs will light-up at the lower voltages where the OEM incandescents won't.
Some vehicles have issues like this when the stock incandescent dome lights are replaced with LEDs (the LED dome stays dimly lit when it's supposed to be off). The fix for them is to place a resistor in parallel with the LED - the resistor absorbs the residual voltage and the LED stays off when it's supposed to be off. I do not know how to figure out what value resistor will work for the tiny dash lights, but surely someone on 'MUD will know how to figure this out...