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That is something I would like to do on my truck sometime... lucky

The 6bt is a wonderfully simple engine. It is COMPLETELY mechanically controlled. The shutoff arm is mechanical but happens to have a solenoid attached to it. And of course it is electronic start. I suppose a pneumatic start system could be rigged onto it. Hmmm...

So, the only things you need on the engine (as mad mike said) are the fuel shutoff solenoid and starter. It is simple to wire up: put 8 volts to the one wire when you want it to "hold" and put the other two wires to ground and a 12v source for the "latch" or pulling up signal. Stock, the latch wire is just put to the same wire as the starter.

If it were me, I would go with a mechanical shutoff (choke cable or something like that) and mechanical gauges where possible (boost, fuel pressure, boost, maybe even tach and speedo), with an old school pyro (powered by the thermocouple) and basic electronic intake air and coolant temp gauges. The grid heater would be powered by a push button or maybe a small 30 second timer :)

These trucks have an indecent amount of wiring (PCM? really?) for the engines and features they have. Building a nice custom truck gives you the opportunity to wire it right (starter as the only electrical engine thing).
 

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If you want to ditch the computer it is a trivial matter to install an old school voltage regulator. They run about 20 bucks at the parts store.

Ask for one for a dodge 1993 d250 diesel, and for the wire connector. Or just grab one from the junkyard. Be sure all your wires for the field control have good connections because if they are poor, you will get poor charging or a voltage fluctuation, like I had.
 
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