can I get conversion tracking working for an external website?
Re: can I get conversion tracking working for an external website?
Does that site have a cusomized thank you page for your web site? If it does, you may be able to include the AdWords conversoin code on that page. That depends on the external website.
You can get a count of the number of people who click on a button by using event tracking in Analytics. I would recommend this method over recording a conversion when a visitor clicks the button. Yes, it will make it tougher to get all the click and sales numbers, but recording a conversion every time a visitor clicks that button may give you data that will make you overly optimistic on the results, or anyone else looking at the numbers.
Take a look at the Analytics event tracking. Start at this page: https://developers.google.com/analytics/devguides/collection/gajs/eventTrackerGuide?hl=cs
Best of Luck!