Adding a voltage meter to my dash...



As technology advances, auto manufacturers have replaced dash gauges with "idiot lights". The problem with lights is that they come on once the failure happens (usually).

I have a 2012 Jeep with such lights and would like to add a voltage gauge. It should read voltages as follows:

1. When the key is in the accessory position, provide a voltage reading on the battery.

2. When starting the vehicle, provide a voltage reading to display the draw on the battery.

3. When running, provide a...

Adding a voltage meter to my dash...