To set-up a feed to CarGurus please go to the Business -> Sales Channels section, under Add Sales Channel select CarGurus and click Connect Channel.
You will then be provided with a feed ID which you will need to give to your CarGurus account manager whilst letting them know you're using the MotorDesk feed - this is typically done by emailing their technical support.
Note, please make sure you've published at least one vehicle to the sales channel to ensure the feed is created before contacting CarGurus.
To have your CarGurus leads feed into MotorDesk's Leads & Chat system simply ask CarGurus to send the emails to your Leads & Chat email account. You can find your Leads & Chat email account address in the Business -> Email Accounts section, it is usually contact@yourdomain.com.