I've done that. The fuel and speedo will read correctly. I remember having to move some wires around in the plug-in because the circuits are rearranged differently for the tach. One thing to watch out for is whether or not you have electric or mechanical oil pressure. About the same time the speedo went to 85 and the oil went to electric(1980?). Figure out which old wire went to what on the old dash and poke em out of the plug to match what the new dash needs.
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Just as if I knew what I was doin'
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Just as if I knew what I was doin'
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