Yes. You may switch to whatever type of gauge you desire including speedo. The sensors are different ie. a mech. bulb sensor which is a pressure device vs. a variable resistor which is an electrical device. An electronic speedo most often uses a magnet attached to the drive shaft with a magnetic pickup which sends a series of pluses to the instrument. Pick up a copy of any street rod mag. like "Street Rodder" or "Street Rod Builder", they will have a number of ads for gauges.

Six volt guy living in a twelve volt world