Pyro probe install

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I just recieved my Isspro pyrometer gauge and I'm looking at it and reading the directions. The part that is puzzling me is the probe has a bushing with it that is suppose to be "welded into a 3/4" hole in the manifold". Now, do I have to do this or should I be able to just drill the 7/16" hole and tap it out with a 1/4 NPT tap and insert the probe? I assume I can but I would like to hear from somebody who has a little more experience than the zero that I currently have. Thanks

Pat
91 4x4

 

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You are correct. Drill and tap the exhaust manifold. I have one on my 89 and one on the 99. Drill in the center of the rear part of the manifold. about 3/4 to 1" above the flange. You do not need to remove the turbo. I was skeptical about this, but if you use a vacuum and then a magnet to get the few chips out of the manifold you'll be fine.

later
don

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1989 D 250 Ice blue met. 5 spd 3. 54, 140,000, Banks stage III powerpack straight exhaust, pump adjustments, still looking for more power ON HOLD DUE TO BLOWN HEAD GASKET!!
1999 3500 4x4 Chassis cab Emerald green ISB 5 spd 4. 10 K&N Filter straight exhaust 9 ft flatbed WARN fenderflares,Let the BOBMing begin!!! 275hp injectors installed, boost and pyro gages, awaiting results of those who have purchased the VA box.

 

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Thanks Big D,
I already had the turbo off the truck since I was putting a 16cm housing on the truck and figured now was a good time to put the probe in. It was remarkably painless.

Pat
91 4x4

 

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Pat,
Glad to hear it is going well. If the probe that you have is a bushing with a set screw to hold the probe in place, than that is the one that I originally had. To me, that probe setup belongs in the exhaust pipe and I wasn't going to attempt to try to weld that little bushing to the exhaust manifold. I returned the original probe for the one that screws into a 1/4 NPT hole (it is less money). Works great with no leaks.
Matt


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90 W250, 5-speed, 3. 54 gears, 16 cm2 housing, tach, pyro, and boost gauges.

 

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LT, the probe with the 1/4" compression fitting is luckily the one that came with the kit. I also slapped on the boost gauge. I started to think I had messed up the installation somehow though because the truck wouldn't make any boost sitting in the garage then I remembered a guy tellin' me the truck had to be under a load to see the boost. I drove around the block but it was 10 O'clock and my gauges were tywrapped out to my hood release to keep them out of the way so I couldn't see exactly how much boost. Just need to install the gauges and the the transmission temp probe and I'll be done.

Pat