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Is the Radio a factory installed unit or aftermarket?
 

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If the gauges and the aftermarket radio quit working at the same time the radio must be wired into the +12 Vdc supply for the gauges, the factory radio is on a separate circuit. See if you can find the wire supplying +12Vdc to the radio and tell me what fuse it connects to. The fuse for the gauges is labled "Meter" and is in the dash fuse panel.
 

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The Speedo has four electrical connections
one to the Odometer
one from the Vehicle Speed Sensor (VSS)
one from meter fuse supplying +12 Vdc
one from ground point C-16 which is on the LH inner fender

The Tach has four electrical connections
one to the Odometer
one from meter fuse supplying +12 Vdc
one from the PCM supplying the input signal
one from ground point C-16 which is on the LH inner fender


Make sure the C-16 ground point and connections are clean and tight.
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