Output set for last gift amount per donor

Hi, 

I'm doing my first solicitation mailing since using Tessitura. I'm good with overall list, but really want to include the donor's last gift amount in my letter and response form, so therefore want it showing, I assume, in the output set (or extraction manager?)

This seems a standard type of requirement for a solicitation mailing...but I can't see in the list of options in the contributions heading of the output set any option for last gift. Love to hear from anyone out there who has done this for pointers in the right direction!

Cheers

Steff