Thanks Bill. I am also looking at the Progressive Dynamics 9100 series and the "Charge Wizard" which seems to make it a 3-stage setup. Here is a link to a conversion with pics by a guy who installed the PD converter in the MagnetTek box:
http://home.comcast.net/~rabarber/magnetek.htm
PD converters come in 30 Amp - 80 AMP. Which would work best with TM?