I have 6 aftermarket gauges in my car. As far as running wires through the firewall goes, you basically have 2 choices. First is to drill a new hole after checking clearance in car and in engine compartment. After you drill, put a good quality rubber grommet in to protect the wires from rubbing against the metal you just drilled through. Be sure to get a good one with some thickness to it, as I have found they are not all created equal. Your second option is to run the wires through with a group that is already there from the factory, either through the same hole or through a hole alongside you make in the rubber boot protecting the wires. I drilled a new hole and set it up properly for the multitude of wires that now pass through the wall. It is best to decide how many gauges you are thinking about adding in the future and plan for them now. The same goes for your power wires for electric gauges and lighting wires. The more you plan ahead, the less teardown of your interior will be needed to mount the new gauge.
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