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I am installing an APC boost gauge in a 2000 C5. This is a gauge that is backlit bright during the day and dimmer at night so it needs a constant 12v even when the ligths are not turned on. So the gauge has an orange labeled for 12v lighting and red for 12v ignition. I've used several sources, ie: fuse #22, even running a direct wire from the guage to the battery to get a constant voltage, but every time, the gauge doesn't illuminate. It will only illuminate when I turn the lights on. Is there another source I should be tapping into? Thanks for the help.