I attached a 1.5 volt AA battery to the said RPM meter and the needle moved a little as suggested by ronsimpson. I tried it with a 13.8 volt regulated dc power supply and the needle moved much bigger(probably 50 rpm). attached is the back view and the whats inside the meter. I also tried to get the reading on the terminals of the rpm meter. It read approximately 27 on X10K . I hope these data will help determine if I can connect these to M+ & M- .
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