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is that possible? currently i have a speedhut tach. On a MSD6HEMI ignition box. I am not sure if so but it is possible that the Tach is showing ie 6000 rpm but actually the engine is reving 7000 rpm? Can I put an Autometer tach parallel on the MSD Tach port to check that?

Any experience with them? Are they worth it? I want to build my own dash in my 72 Dart. And after my 5speed conversion I really need to know my speed correctly. Calibration is not possible. And Speedhut is the only brand which can offer speedometers in KM/H (metric) up to 250 km/h. And they...