I installed an EGT gauge. I got it here - All EGT Electronics Meter Kits
I don't think you will find a gauge with EGT and Fuel Pressure combined. I think OP must have two separate gauges.
On the CAT C13, there is a pipe plug on the turbo exhaust outlet pipe that will take an EGT probe. This is the easiest place to install the probe.
Some say it is better (more accurate) to measure the temperature before the turbo, but then you need to drill and tap the manifold. You can always start by installing in the existing threaded port (to get it installed/working quickly) then move it later to the manifold if you determine that is best for you. I've considered doing that but I would want to remove the turbo so I'm not taking any chances that metal shavings from drilling/tapping will get in the manifold then go through the turbo. Not convinced myself yet its worth that much effort.