Cool thing is you can change the units for most of them. The choices for the tach go up to ~13k RPM and speedo go up to ~420km/h (only tested on NSX-R so far), so for cars where the stock tach/speedo maxxed out after tuning you can now drive them in cockpit view properly with HUD off

The tach has a shift light as well!
The only dynamic ones I found besides those are boost gauge, oil pressure and fuel. But hopefully this bodes well for future GT games where you can get engine damage from overheating etc.