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Speedo/Tach light

OK, here's a good one for you guys to figure out. My speedo/tach lights stopped working. After tracing, I've come up with the following. If I disconnect the wiring from the dimmer (rheostat)and connect them together, the lights come on. This led me to believe that the dimmer had gone bad. I checked it with the multimeter and it checks out OK. I hooked up a bulb to the dimmer and it works fine. Put it back in the car and same problem, speedo/tach lights don't work. I've even tried a spare dimmer switch that I have and it doesn't work. Any suggestions? Thanks in advance
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