My Diprocol (spelling??) guages (boost, trans temp and pyro) arrived yesterday...the white face gauges look great. The directions for installation are weak at best, and this forum has provided more insight than the instruction sheet.

The trans temp is no problem...I have a kit to install the sending unit in the oil pan....

BOOST - I am not a drill and tap guy, and I would prefer NOT to mount gauges that way. I understand there is something called a boost bolt to make the installation easy for the boost gauge. Where can I get one of these jewels and about what do they cost??? Any pics would sure be appreciated.

EGT - I have contimplated both pre & post turbo installations for my EGT gauge, and have decided on the POST turbo. My engine will remain stock forever & an email from Cummins indicated that is the best place...

Anyway, I think there is something called a band bung or banjo bung or something like that for installation of the probe in the exhaust...what exactly am I looking for and where the heck do I find it???

Trying not to sound too dumb, but this is all new to me...thanks in advance

 

i put mine post as well...drill and tap the cast iron elbow on the down pipe-its held on with 2 band clamps 1 on top and 1 on the bottom. loosen them and remove the elbow.place in a vice to drill and tap.start with a small drill bit and work your way up to the size you need for your probe.

 

Great...just the information I was looking for...I don't mind drilling and tapping an elbow out of the truck....thanks a bunch!!

 

Piers (http://www.piersdiesel.com) has boost bolts - they're less than $20. Pictures can also be seen on that site. It will give you an 1/8" NPT female fitting, into which you can screw an 1/8"NPT to 1/8" compression fitting that most likely came with your boost gauge.

Without getting into a pre/post debate - if you want it post turbo, yes, you can remove the elbow and drill it (11/32" drill bit - 23/64" is a little more accurate if you have one) then tap it (1/8-27 NPT tap) for the thermocouple fitting that should have come with your EGT gauge (verify that it's an 1/8" NPT fitting, which is about 1/4" wide, and not a 1/4" NPT fitting, which is about 1/2" wide [ clear as mud, no? ])

Another option, albiet even less accurate, is to drill a hole in the downpipe itself, just big enough to clear the body of the thermocouple (the flange of the thermocouple will press up against the exhaust pipe), and secure this with a special hose clamp that has a hole for the thermocouple to pass through. Some gauge kits come with this (my Autometer did), some don't. But - you're better off drilling/tapping the elbow.

A third option, and is what I did for my post-turbo EGT, is to drill a hole in the downpipe and use a weld-on bung (little round washer-looking thing, about 1/4" deep, smooth on the outside, threaded for 1/8" NPT on the inside) to mount the thermocouple. You do this for mounting in thin-wall material (like exhaust pipes), or for downpipes that bolt right up to a turbo (ie. without an exhaust elbow like you have). Again - you don't need to worry about this - your best option is drilling/tapping the exhaust elbow.

 

Excellent...again, exactly the info I was looking for...now if I just had the truck here in the office I could get started....thanks again!!!!!!!!!!!

 

Hey Tom 488

Might you still have that hose clamp? I can't seem to find them anywhere. I would be happy to pay you for it and postage as well....

 

Zog, don't be such a wuss and put your EGT probe in the right place . A new ATS manifold isn't that expensive, in the rare case you screw up your stocker. I had never drilled or tapped anything in my life, and did the manifold without an issue.. If you go post turbo you're going to have a lot less useful data. If like you say your engine will remain stock forever, save yourself the hassle and return the EGT gauge, you do not need one.

 

Just wanted to mention that I talked to Andy at Geno's....seems like a great guy. I ordered a boost bolt for $8.95 and he said it comes with directions for location and torque...gotta love this kind of service...only wish I had heard of Geno's before.

Also, I don't think being prudent is the same as being a wuss...I have never drilled and tapped anything else before and I have no desire to experiment on my intake manifold. I will do the elbow since it seems to be a lot easier fix if I goof it up...maybe I am being too cautious, but I am also coinciding with Cummins and lots of truckers by putting my probe post turbo....I don't see the issue.

 

I would think that you would want your sending unit Pre turbo for that fact I would want to know the temp of the air Im feeding it. I have been told the diffrence in temp from pre to post turbo can vary 400 deg. Post being 400 less then what pre says? Im not a mechanic but that seems to make sence

 

Zog,
Sorry for the delay in getting back to you. No, sorry - I don't have the clamp anymore. I looked around for it, but must have tossed it back when I first installed the pyro (that was over a year ago). A normal hose clamp can be easily modified to do that - just need to drill a hole in the middle of it the same diameter as the thermocouple body.

Otherwise, you can probably find it at a plumbing supply or pool supply place. When I helped a buddy put in a new pool heater, pump, controls, etc. we had to install a temp. probe in the pipe coming out of the pump. The manufacturer supplied the thermistor, an O-ring to go around it (since it was going into water), and the same type of hose clamp that we threaded the thermistor through and secured to the pipe.

But - with all that said, that's really a less desirable option than drilling/tapping the exhaust elbow (which is also a less desirable option than drilling/tapping the exhaust manifold, but we won't go down that route )