Review on Faria 3003 3478 Battery Condition Gauge Coral by Donald Phillips

All cars need this indispensable gauge: It shows the "state of charge" of your battery. Your "Ampere" gauge shows the performance of your charging system, but IT DOES NOT WARN YOU OF AN EMPTY BATTERY. It's easy to install with just two wires, if you have on hand you can do it yourself in an hour. I called the company: DO NOT leave sensor "on": turn on before starting car in the morning, note "state of charge" in battery, then turn off. You'll soon see a pattern in your battery's "behaviour" (state of charge) and won't fall into the scary realm of "socialist/progressive utopia" when it gets dark.