As Bullhorn's API isn't compatible with Geckoboard, we recommend using our command line app to automate bringing your Bullhorn data into Geckoboard using Datasets. This will require running a script to execute the program from a command line.
Bullhorn to dataset is available to download and the quick start guide can be seen by scrolling down the page. You can then build visualizations from your dataset. To learn more about creating dataset widgets, see our guide to creating visualizations from datasets.
By default, this app will periodically pull data from Bullhorn and push to Geckoboard every 15 minutes.