$job.earliestTime$ - Initial time a search job starts
$job.latestTime$ - Latest time recorded for the search job $job.resultCount$ - Number of results returned by the search job
$job.runDuration$ - Time, in seconds, that the search took to complete
$job.messages$ - List of error and debug messages generated by the search job
Search Results (first result only) $result.[fieldName]$ - Results are referenced directly by their field name.
Refer to Search Result Setter example on the Splunk 6.x Dashboard Example App.
<query>index=_internal | top sourcetype</query>
<!-- Use the following search events to access job properties, and set tokens that can be accessible throughout the page -->
<!-- Progress event has access to job properties only (not first result row) -->
Also for using HTML Panels in Splunk Dashboard refer to Null Search Swapper example. Following is a snippet from the same
<p style="color:blue;margin-left:30px;font-size:14px">Search returned no results, so we've hidden the chart!</p>