How would I wire this? I dont want it on 2-4-7. It says it comes with a pos + and a neg - wires. So I was just going to run the pos and neg from the volt meter to the pos and neg on my sub amp. But it willl be on continuously. So how do I get it from staying on all the time and is that the right way to wire it.
New LED DC3 0 30V Blue Volt Voltage Meter Display Digital Voltmeter Self Powered | eBay