SearX
SearX is a metasearch engine. That means it returns results from other selected search engines. It's accessible via an onion address and provides a private search ability. Really the only advantage it gives you over searching directly from a Tor browser is the ability to customise your search experience.
In terms of security both the connection between you and the server, and the outgoing connection from the server to other search engines are onion routed. This should give you a reasonable level of search privacy.
Installation
ssh into the system with:
ssh myusername@mydomain.com -p 2222
Select Administrator controls then Add/remove apps. From there you can use cursor keys, space and enter keys to select searx.
Once it has installed go to About on the Administrator control panel and look for searx. Take a note of the onion address, and you can then enter that into a Tor compatible browser.
Make it your default search
In a Tor browser click on the magnifying glass icon next to the search box and you can then add your metasearch site. A small icon will appear called "Freedombone Metasearch" and you can then right click on it and make it the default search.
Enabling password login
It's possible that you might not want just anyone on the interwebs to be able to use your metasearch engine. Even with the onion routing this might carry some legal risk or make you a target for denial-of-service attempts (although Tor's rate limits and the firewall will give you some defense against that).
To enable password login go to the Administrator control panel then App settings then select searx and Enable login. If you select "yes" then the password will be displayed.
Customization
It's also possible to customise the background image if you go to App settings then select searx.