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The LCD panels that I could get also had the reversed pin problem. Simple solution is to remove the last 2 pins so it is a 14 pin strip then solder a couple of crossover wires from the board to the led. Leave a bit of slack so you can get them apart.
I actually connected the LCD backlight to my instrument light circuit. From memory I stuck a 750 ohm resistor in series. Works fine.
I can see the display just fine during the day & the backlight comes on when I turn the lights onto the first position.
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