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I decided that a dual boost/EGT gauge would be too hard to read while driving so I bought a VDO pyrometer and thermocouple from Don's Sport Vehicle Sales in Perry, Michigan. They are on the web as "egauges.com." I also bought a 15 psi VDO boost gauge and a VDO voltmeter. More on them in a later thread, maybe. (You are right if you guess that I like VDO gauges. I've had 'em on my BMW motorcycles since Shep was a pup.)
The thermocouple comes with a fitting that ends in a 1/4 male pipe thread. I did some measuring and testing and discovered that, although the hole in my exhaust manifold does indeed seem to be 10x1 mm threaded, a 1/8 male pipe fitting goes into the hole just fine. All I had to do was adapt the 1/4 fitting on the thermocouple to the 1/8 hole in the manifold.
I found a 1/4 female to 1/8 male pipe fitting in my "Plumbing" box. The thermocouple probe wouldn't fit: it was 1/4 inch in diameter and the hole through the fitting was too small. Since the fitting was brass, I just drilled it out. The thermocouple then went in like a charm. See the pictures.
Tomorrow I'll put the thermocouple in the manifold and try it out for the first time. I'll post some more pictures at that time.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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