Phil,
I believe p/n 5244 probe is 3/16". You could double check the Autometer web site.
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GroundPounder,
The best place to put the Thermocouple is Pre-Turbo, or in the exhaust manifold (see below).
You don't need or want the clamp type T-Couple. You won't need the 'Bung' or weld-in-fitting. You will drill & thread you own hole.
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If you want to run it Post-turbo, you can drill & tap the cast iron elbow that comes off the turbo. Or buy a pre-tapped one from Geno's garage. You won't need to weld anything.
See some installation instructions here:
http://www.dieselpage.com/gipda.htm
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Bill R
94 2500 SLT 4x4 5 Speed, 3. 54 LS, JRE 4" exhaust, Autometer Pyro, Boost & Water temp gauges, Bosch 215 HP injectors, Timing @ 14. 7º, JRE Stage III #4 plate 270/675, AFC spring kit, Scotty Air, Bully Dog Propane Injection, Roadmaster Active Suspension, Optima Red Tops, Geno's Exhaust Blanket, Espar Heater (won it!), Synthetic lubes throughout.
[This message has been edited by HEMI®Dart (edited 02-15-2001). ]