The TR8 has a tachometer with a 5500RPM redline, The TR7 tachometer has a redline of 6500RPM.  I’ve also seen a TR7 tachometer with a redline of 6000 RPM

6000RPM redline TR7 tach:

6500RPM redline TR7 tach:

5500RPM redline TR8 tach: