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I think it's autometer that has the new diesel tach adapter that works off of the alternator. That and a self regulating alternator would get you around that problem. Just a thought.
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'85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun! 
'95 Cummins grampa truck, embarrassingly stock
'12 Cummins, deleted
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