Just bend the leads from an incandescent bulb to either side of the board and see if it lights. Or a test light can check for powers and grounds of course. You can use a scan tool to view data stream so you can fairly accurately replace the speedo and tach. I suggest filling the car to the brim at a gas station then replacing that needle so full is actually full and not 1/4 past full. Worked great on my car. Obviously you can double check the other gauges with the data stream going.
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