I tried to install the Earl's sandwich type thermostat as shown in CobERA's post above but I couldn't get it to work. It was just too tight for the
oil cooler lines at the sandwich adapter to clear the frame. I could have "forced" it to work by raising the engine a little bit higher on the left motor mount while dropping the motor a little bit on the right side, but doing that put my sidepipes too close to the cutouts in the body. I plan on buying and trying the Mocal sandwich thermostat. I haven't decided whether to go with their model SP1T or their SP1T-HF. Both are quite a bit smaller than the Earl's unit and I think either one will work.
Chris