Use LED VU meter as Tachometer?
Somedays back i bought a digital tachometer with dial and needle. I wanted to test it, so i connected its power terminals (12V) and connected the Tach input wire to audio speakers output (+ve) terminal and played a loud song.
I saw Tach needle going up at certain frequencies.
I want to ask that if tach can detect audio signals SAME AS a VU audio meter does. So, CAN A LED VU METER BE CONNECTED SAME IN PLACE OF TACHOMETER to detect car RPM signals.?
Plz help and guide.