Try using the site's search engine.  This is a fairly common topic and you should be able to turn up several previous threads quite easily.

You're using the search facility in the banner at the top of the page?  With the defaults you should get more than you want when searching for tach.  In fact, I got a lot of attach and attachment in that search.  I'd suggest possibly tacho if you get too many.  No search results is baffling though unless you changed the defaults, purposefully or otherwise.  They are set to go back 180 days in all forums by any posters.

No search results is baffling though unless you changed the defaults, purposefully or otherwise.  They are set to go back 180 days in all forums by any posters. [/quote]

Thanks Rob, it was operator error.  It works better when I enter my forum name.