I've read elsewhere that the actual headlight dimmer switch itself can be the cause of a lot of flickering issues. On my car I have to turn my dimmer dial back like 1/16" to get max brightness without flickering. If I turn it the entire way to full brightness my gauges flicker like crazy.
2003 CD Silver SVT Focus ZX5
| Audiophile | Moonroof | Mach HID's | Aluminum shifter base bushings | Sony CDX-GT420U |