edward_davis
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I have replaced the insides of my original Smith's tach (RVI 1439/O3A) with those from an MGB tach I bought on e-bay (RVI 1439/O1A). The ad said it was in working condition, and there seems to be no problem with the meter itself, like my old one was having. We'll see when I get her all hooked up this weekend. Interestingly, there were only two differences in the gauges, except for the design of the faceplate. The MGB gauge was oriented upside-down relative to the JH gauge (the faceplate attaches 180 degrees). And there was no mystery capacitor in the MGB gauge. I did not check to see if the resistors were the same, though, and the potentiometer was of a slightly different design. Hopefully it'll work.
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