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BTW, if you have a CR of around 15-18:1 and direct injection, you won't need glow plugs or ether or any other assisted starting until you get around 50 degrees. Under that, you could use a grid heater off of an older Cummins... you should be able to get one cheap that you should be able to fabricate onto it. All it is is a set of elements that the intake air goes through to get pre-heated before entering the combustion chamber. Worked on the older Cummins down to about 0 degrees if you have strong batteries. Anywhere below that, you'll want to have a block heater.
Cummins don't have glow plugs, only grid heaters. I started my '99 on weak batteries (dual batteries) once in 7 degrees and it had been sitting at that temp for over 12 hours. It took about 4 revolutions where as it normally only takes less than one, but it still fired up. It smoked for about 2 minutes, but it eventually cleared up.
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