I don't know if I can think of a tartan that is predominantly pink off the top of my head, but the Offaly county tartan has a pink line in it. You can see a picture here:
http://giftshop.scottishtartans.org/Irish.htm

What is the shade of pink you are looking for? Maybe you can get by with some of the weathered red tartans?

Can you post an image?

Aye,
Matt