I've got one of these units under the dash and it works perfectly.
AUTO METER 9114 LED Lighted Gauge Dimmers
Net Price : $28.60
- This compact separate module is designed to allow for isolated dimming for all Auto Meter gauges utilizing LED lighting technology separate from your vehicle's OEM dash. These Auto Meter LED lighted gauge dimmers allow you to dim your LED gauges separately from other factory dashboard gauges. These dimmers are compatible with all other LED-lit instruments, and are capable of adjusting up to seven gauges together.
- Rotary Switch Actuation Style with Constant Circuit Activation
- Plastic Switch Material with Black Switch Finish
- Sold individually
Not as elegant as controlling directly through the headlight switch, but perhaps an underdash mount would be OK.
Could you also post a wiring diagram when you repost the picture?Here is photo of the invertor I mentioned before. The output that powers our gauge lighting is proportional to the voltage input.
Sean,I double checked my wiring last night and I have both white wires (from the AC module and the 3-wire connector) connected to the dash lighting feed wire from my wire harness. And if I remember right, the needle dims but the gauge face doesn't. Should I check something else? When I put my dash back on the car, I'll double check.