I just dug my Arduino and LCD Pi Plate out of the cupboard for a little project. When I last posted about the PiPlate to Arduino wiring, I linked to a page that showed the names of the GPIO pins, but not the numbers I was referring to. Here is a better reference for the GPIO pin numbers.
The PiPlate to Arduino pin wiring I had before is still correct, providing you’re using the same pin numbering as in the above linked article.