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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I just tapped into a 12V source in the A-Pillar. It makes the gauge light up when ever the key is on (during the day) but doesn't really matter. This way all I had to do was hook up the 12V, ground, and source. I grounded mine right to the A-Pillar frame. The only wire I had to run under the dash was to the temp sender. I've had mine hooked up all summer and it works great.
I don't remember the color of the wire. I just probed around until I found a wire that had power with the key only. I got my transmission and differential pans from PML. www.yourcovers.com