Fenders will take quite a bit of work and effort with wheel fitment etc...
You can get m2 seats.
DIY on the colored stitching
https://www.2addicts.com/forums/show....php?t=1371568
Your gauge cluster is basically the same. You can try and fit the cover for look but I'm not sure how interchangeable these are.
HUD won't be a easy addition.
P3 gauge, awron, or the electronic steering wheel can all give oil temp and integrated into car. Cheaper option is to get it off phone with torque app.