Conversion tracking

Hi!

Finally got a successful Adwords campaign running, but I'm struggling to fix the Conversion tracking via Google Analytics.

I've used Google Tag Manager to download everything to my site, including a conversion linker etc.
The tag itself works, but the source is not tracked (Aka I can't tell what conversions came from my ad).

Any suggestions on how to fix this in Google Analytics? So far it's been a nightmare..

Thanks in advance!