Hi sweatyburrito
Just FYI, Pix 515e is out of support, I would suggest to go with smaller ASA i.e. ASA 5510.
here is the other link - shows vpn config.
https://supportforums.cisco.com/discussion/12270061/solved-rv320-site-site-vpn-asa-5510-not-working
hope this helps.
JD...