The other end of the wires is going to have a female spade connector for pulling power from the fuse box and the other will have another ring terminal for a ground source. Use 16 gauge wire for the hookup if the wire was not provided with the voltmeter kit.

How To Install Auto Meter Voltmeter Gauge Electrical Jeep
How to wire voltage gauge. Always have the wire leads cleaned and straight while making the connection. On one end of each wire you will need a ring terminal to slide over the volt gauge studs. Under the dash usually works. Remove 12 inch of insulation from each end of this wire and place a spade terminal over each end. Your vehicles firewall is the metal panel. Step 4 loosen the screw of the power terminal of the instrument next to the voltmeter.
When running the wire from inside of the vehicle and into the engine compartment it is easiest to run it through the same seal as the vehicle factory wiring. Find a mounting location for the voltmeter. When you put in the stock style volt gauge you are going to add two wires to it. The main panel for your dashboard normally doesnt have. Easy installing of a car volt amp gauge. Cut a piece of black wire long enough to reach from the battery to the voltmeter and route the wire from the battery to the voltmeter.
Remove the bottom of the dash to gain. The voltmeter has three wires coming from it the red power lead the black ground wire and the white wire that provides power to the voltmeters instrument light. To reduce the voltage drop make sure that you are using parallel connections. Poke a wire insertion tool through. Solder one spade terminal to each end of the wire. Mount the voltmeter with the screws.
Make sure that the gauge and construction of the additional wire or the new wire are the same as the original wire. Feeding the wires 1. How to wire voltmeter gauges on a car step 1. Mount the gauges in a gauge pod on top of your dashboard. Find a hole and grommet with wires through it in your vehicles firewall. Apply the heat shrinking tube to protect the joint and the connection.
Using the appropriate size wire run wiring from where the gauge will be mounted to the positive battery terminal.