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The speedo and tach are actually two separate units and can be swapped independent of each other. And to answer your question more directly, yes I believe the speedo is interchangeable with the gassers, but unless you swap over the PSOM as well (it's a module on the back of the speedo) the mileage will display whatever was on the gasser.
That's just the circuit board on the back. The gauge heads plug into the board through the "base" of the cluster. Take off the lens and it will be clear how the various segments can be separately removed. Lightning speedometer (140 MPH?) is a favorite mod.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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