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The volt gauge is wired thru the ig.sw. to a fuse that also powers all the other gauges (F.17 - 10A) and goes to ground G200 (passenger kick panel) which also serves the speedo, cruise, RKE, & anti-theft.
The tach is fed by the same fuse thru a different connector in the cluster, which also serves the warning lamps (ABS, 4x4, LOWRANGE, SRS, CEL) & grounds at G201 (driver's kick). It receives its signal on the W/Pk wire from the coil - not the distributor.
No, the gauges don't wear out.
So it sounds like the fault is inside the cluster. Pull it, take the lens & blackout ring off, pop out the gauges & then reseat them to break up any corrosion on their terminals. Use brown paper or a pink eraser to polish the connector terminals for the film circuit. For more info, click my black Bronco in my sig & read the captions in the Low Fuel Light album.
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