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For an older non-turbo, non-OBDII diesel, I think I would have to agree with you Gravedigger. Keeping your foot out of it and monitoring your EGT would be a way of helping with fuel economy. 600 degrees is a good start, but you'd have to experiment to find your 50 mph (+/-), flat-road EGT. Then keep your EGT at or below that, even on acceleration. My happy spot on my 96 F250 PSD just happens to be 600 degrees also. I'm not sure what else you can do with it for instrumentation other than an Inlet Air Temp (at the filter) or air pressure/vacuum on the inlet manifold (?).
Obviously, you know the tricks for HP. I'd at least change the intake setup and maybe the exhaust if it has a cat and/or muffler. I'd love to have a little diesel to play with!
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