Dude, thanks a whole lot for your help and inputs. I really really appreciate it. Here's a virtual beer
I'll see what it will be like, but I believe it will be just fine if the gauge is fully on, as the amber lighting isn't too bright, and will suit the inside of the car just fine. If it turns our it's way too light, I'll then hack it to the radio switch or something.
Also, thanks a lot for the tip about blowing the fan to check if the fuse holds up. That fuse is 15amps, so I'll see if that's OK, otherwise I'll go check other options.
Thanks once again!