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If you're looking to capture UTM parameters via auto-tagged links and put them into hidden fields, you're mostly going to be out of luck. Auto-tagging uses "gclid" unique values, which are mostly indecipherable to anything except for Google Analytics. Manually tagging AdWords ads will give you the required level of specificity if you need medium/source/keyword level granularity.
I find the best compromise is to have separate programs for your channel and vendor with unique landing page URLs, which will give you bubble-up reporting on how big initiatives are turning into volume of leads and costs per lead. Then so long as conversions are being recorded, you can optimize within the native tools (GA and AdWords interface).
Having a separate program and separate landing page URLs also helps because you can optimize more quickly and accurately. It becomes pretty quick to clone a landing page and then tweak the content so you can get a higher quality score (and therefore lower CPC) per group and specific ad tailored to the keywords and ad copy. And because the URLs are unique to your advertising (aka, aren't accessible except through those ads), you can more confidently say "leads who converted on that landing page are attributed to the success of those paid advertising efforts" without worrying if someone came back with crazy navigation and was falsely attributed as a success.
If you didn't care as much about the quality score of landing pages and just wanted straight-to-the-point and easy, you could watch for people converting when their URL contained "gclid" at any point—you'd only be able to see if someone came from AdWords or not, and not see any other specificity from that, but depending on your business case that might be an appropriate path.
Best,Edward Unthank | Founder, Etumos
We have auto-tagging turned on but we still add our own custom parameters.
The benefits of both are that you can optimize within Adwords/Analytics as Edward mentioned but you also retain the granular Adwords data for longer-term attribution.
This is perhaps less important if you only need to track an immediate conversion event. But if you want to know which of your keywords or ad variations is turning into the most revenue, or even better, produces customers with the highest yearly value or lifetime value, then it's important to have that data in your CRM.
So your options then become populating those data fields via manually-added parameters or have unique landing pages tied to specific ad groups and keywords, which Edward alluded to, so you can pre-populate hidden form fields on those pages with your values. (Or a combination thereof.)