I tried unplugging the headlight harness and checking voltage with the running light switch on (headlight switch pulled half out). I can not find dinner power to hook my a pillar gauges to. I want them to come in with running lights and dim with the rest of the dash, as if it were factory. If anyone know where this wire is if love to know! Going home next weekend to finish them up! This is a 1993 w250.

Sean

 

20 gauge orange wire coming off fuse 14. Any 20 gauge orange wire you can find. Ash tray lamp, radio, AC and heater switch, tachometer connector to name a few.

 

Ok thankyou. I'll give that a whirl when I get home this weekend. Thanks.

 

Use the wire on the tach plug. One is a dimmer wire. That is the easiest one to get to.

 

I tapped into the fuse for the instrument cluster lights using a fuse tap. Maybe not quite the best or ideal way but my gauges and instrument cluster have LEDs in them so there's not much power being drawn through the circuit to pop the fuse.

 

Considering my gauges are where my ash tray use to be, hookup was easy. Everything I needed power wise was right there.

 

Where is this tach plug? My truck didn't come with a tach
And I thought most didn't.

 

92 and 93 did,

Picture of the plug ( and a lot more info ) here.

https://www.dieseltruckresource.com/...ry+tach+wiring

Enjoy!