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The switch is only for 4, 6, or 8 cylinders. When I get some time (very busy with farming right now), I'll pursue Chuckey's ideas. The electronics are enclosed in a metal case which has a crimp around the dial holding the whole thing together.......it will take some effort to get the crimp...
The tach I want to use is electronic. Connections are: 12V power supply, one input lead to ground, other input lead connects to the negative side of the engine coil, and a slide switch tells the instrument how many cylinders the engine has (in this case =4). The tach just counts the pulses...
I have an older 0-5000 RPM analog tachometer that I'd like to install on an old points type ignition farm tractor. Am looking for a simple device to multiply (double or triple) the tach input, so 0-2000 RPM (actual) will indicate closer to full scale on the faceplate. Full output RPM of the...
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