It's very easy to install and works great. That's a deviation of 0.2 to 0.3, but stable, so no problem. Connects directly to the batteries with the lamp's power cable. I put mine where the radio would be as there is no radio in my car. Pull the cable back under the carriage into the battery compartment and secure it. This display uses so little power that leaving it on all the time is not a problem.
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