Install the Westach combo gauge yesterday on my dad's 6.7L. Everything went the hard way except the pyro installation, that was the easy part.
Didn't realize the new trucks uses low voltage for the IP lighting, so the incandescent lighting on the Westach doesn't work when tapping the OR/BR wire to the dimmer switch. Have a temporary hook up for lighting now, will fix it the right way once I download the '07 wiring diagrams from the Dodge Bodybuilders site.

MikeyB

 

Could you hook it up to the headlight switch? That's what I did on my old truck-

BigD

 

I did have it hooked up to the dimmer control side of the switch. Don't know if all the power is low voltage through the switch housing though. Will have to download the wiring diagram and go after it with a VOM looking for 12v. Will also have to install a potentiometer for the brightness.

MikeyB

 

I don't know that this will be of help, but I installed Isspro gauges from Diesel Manor in my 2007.5.

I used the instructions at the following link.

http://www.dieselmanor.com/diy/CMS3-...ugeinstall.htm

The lights in the gauges work and dim with the dash lights. Since that part of the install went well and the lights worked I didn't check the voltage. I "assumed" where I picked up the lead was 12 volt, but I don't know that for a fact.

Good luck


George

 

George,
I did hookup to the OR/BR in the #2 position on back of the connector. But with the bulb in the circuit the IP lighting acted goofy, removed the bulb the IP lamps worked perfectly. Checked the voltage on the dimmer and the range is about 1v-4.5v.
Does the Isspro gauges use LED lamps?

MikeyB

 

You might find an led conversion here. http://www.superbrightleds.com/led_prods.htm