I pulled the radio box down for the last time and installed the exhaust fan. That was a bit nerve wracking, since I had to cut slots in the pretty mahogany box. In retrospect, I should have done that before I even assembled the box. Fortunately, everything turned out OK. In other good news, the temp-sensing fan controller works! I aimed a heat gun up toward the sensor and after a few seconds it came on!
1969 Chris Craft Roamer 46 Refit: Helm Station Radio Box III