Sycamore;
If I may, blue is purely the graphical display of fuel quantity on the CPDS, as seen in the above pic.
CAD indications are amber, (apart from PITOT being displayed green when they're switched on). There is also a Master Caution warning light in front of the pilot that illuminates each time a caution comes up on the CAD. This also creates the beeping tone through the I/c. These are extinguished by pressing the cancel on the cyclic..
All the reds are on the Warning panel, which is at the top of the instrument panel.