Russ,
I could never get mine to light off at a glow plug setting of 65. It will vary somewhat depending on the plug you are using, how far the coil is pulled out, and what your ECU battery voltage is. For a McCoy MC9 60 works most of the time, but for reliable starts I use 55.

A good rule of thumb for the propane gas setting is to set it at 10 less than the ambient temperature (in degrees F).

Joe