Mounts next to existing signal light. There are two connectors on the back of the control panel that mate with the mounting holes of this unit. I cut a hole, installed it and was a little annoyed that the end didn't go through the panel - flush at best. When connected, it immediately showed the full charge status of the battery. I haven't driven the car long enough to compare the gauge to the battery level, but I have no reason to doubt it.
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