Hi,
Please import this new device template to see if it will work better for you. It has quite a few monitors right now, ranging from bandwidth monitors to VPN status information and intrusion/virus detection. I will be adding hardware sensor monitors before release though, so those will be added when the template is released.
dl.dropboxusercontent.com/.../Fortinet_Firewall.xml
Notice that the template name is Fortinet firewall, so you will have both a Fortigate and a Fortinet template in your system. Be sure to select the correct one when applying. At release, the Fortigate one will be replaced.