My 1990 Dodge with the 5.9 Cummins did not come with a factory tach. There are after market tach set ups that have you put a magnet on the crank sprocket with a sensor mounted to count each pass of the magnet. that may be an option for you.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D