This app was mentioned in 2 comments, with an average of 1.00 upvote
Yeah, when in the driver's seat with correct FOV you usually can't see important information as it's cut off. There is a solution though, using a smart phone and an app. There's different solutions for this but currently I'm using Dash Meter Pro which works great with Dirt 4 and Dirt Rally.
https://play.google.com/store/apps/details?id=com.sensadigit.dashmeterforf1dirt
Can see all the relevant information in all cars with ease. Get a nifty little desk mount for the phone also to set it up nicely next to or under the display...
I use Dashmeter Pro on a Samsung Galaxy Note 1. I use USB tethering for the least amount of lag. I have the phone mounted on the G27 wheel with a car GPS mount bracket. Or I place it right under the monitor.
I don't use the stock profiles for Dashmeter Pro, but have made my own to make it look more like an actual dashboard. There isn't a whole lot of telemetry data you can get from Dirt Rally, but DMP display has quite a few customization options.
SimCommander 4 will let you make one for an attached LCD display and has also ton of customization options, but I've never tried it with Dirt Rally.