I am a proud new owner of a used 99 3500. I had a Ford and sold it to get a cummins, I took the isspro gauges out at sale time and need to put em in the dodge. Where is the best place to tap the manifold for a pre egt and where the heck does the boost tube go? The cummins is all foreign to me.

 

Look a little farther back in this forum and you find a post I made "03 EGT Probe Location". I think you will find some, if not all, of the information you need.

 

For the boost gauge, there's a plug just behind the fuel filter in the manifold you can use. It's like a 1/2 NPT and needs to be reduced to 1/8 NPT for the boost fitting. If you look hard enough you can find an adapter that goes from 1/2 to 1/8 in one step. I did not think about that when I got mine so I actually went 2 steps.<br>Some drill and tap the air horn, but I saw no reason to complicate things when I could just remove the plug in the manifold.<br><br>For your EGT probe, see this link:<br>http://www.tstproducts.com/gauge_install.html<br><br>Chris

 

It's a 3/4 in. plug and it is the one to the left of the MAP sensor. You can get a 3/4 to 1/8 reducer at the hardware store.

 

Oops. I hate when my memory fails. Thanks Katoom.<br><br>Chris

 

Sorry guys but I am still confused where the boost goes, I got the egt no problem. Can I see the 3/4 fitting? Looks like several of them to me???????