mounting street gauges on a dr dirt model

can i take the speedo and tach from a 90 dr 350s and put them on my 91 dr 350 (dirt model), if so, what powers the tach, does it determine revs off of the ignition box, or does it come from the coil...? also, will the already odometer cable power the speedo and read correctly?

I can answer half of your question, the speedometer will work fine off the cable and will be correct.

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