Bill: If you want to go with a Honeywell, see here (post #2) for what I did. I have a wiring diagram attached for a ColemanMach to the Honeywell.
The Honeywell I used does not have fan speed control, so you either have to pick a speed or install a SPDT switch as I did. I mounted a mini-switch in mine, as you can see, but you could mount an RV-type rocker switch in the wall next to the t-stat. I may end up doing that, as the DW has problems with the tiny little switch. If you want to go that route from the start, I'd recommend a JR Products model # 12625, ON-ON switch.
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10