Ran the RB-30 with 10.5 on a tight twisty track last night.
The car was awsome, I under geared it slightly at a overall of 7.0.... I feel I could have gone up at least 2 pinions and it still safe.
Speedo stayed very cool, motor got warm, but I didnt run a fan on the motor... only the speedo.
If anyone has any troubles or questions, ask away and I will try to help...i did say try!!
Can up load photos of the speedo installed in a Corally RDX Phi if interested?