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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 7641060" data-attributes="member: 576029">you realize it takes a 5V supply?  try to find one that doesn't require you build a DC-DC supply.  or build your own with a voltage regulator circuit.also, you need to buy a shunt resistor that has a voltage drop the ammeter will accurately register.  so a 50A shut resistor is about $10.  then the meter monitors the voltage drop across the shunt (usually 75mV).  and the shunt goes in-line with the ground wire.  the current on the ground wire causes a voltage drop across teh resistor, the ammeter measures the voltage and calculates the current.for car audio, a 100A ammeter with a 100A shunt makes more sense (and costs the same).  look on eBay instead of Amazon for a larger selection.</blockquote>

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