VDO Tach Gauge Wiring

I am wiring the gauges in my center pod. I pulled the power for the backlight from the clock and that works.

I need to run switched 12 and a ground to the tach. I am assuming if I pull 12v from the backlight it will only work with the lights on. Ideas on where to pull switched 12v from?

Am I ok just connecting the backlight ground to the gauge ground?

Purple - constant fused power
Brown - constant unfused power
White - switched unfused power
Green - switched fused power

Lucas wire colour codes for Land Rover

Don't use the clock purple for the lighting as it will stay on even when the truck is off.

Pull the lighting from behind the binnacle /main gauges it's red with yellow stripe .

Pull the switched power from the same place , any white wire back there or there is a white wire under the plastic parcel tray behind the center dash position

Gauge lighting ground sould be one wire to the chassis , separate from the signal wire grounds . You can use the gauge to ground the lighting as long as they are Daisy chained and one goes to ground

The ground is not important for a tach. Anything will be fine.

What gauge wire should I use for the alternator?

It doesn?t matter. It is just a frequency measurement. There is no current flow.

If you talking about the tach signal wire , something small is fine . It carries no serious current.