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You know another thing could be the gauge. I don't know how we could check it though. Maybe somebody else here has figured that one out.
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I checked mine with an Infrared non-contact thermometer from Sears. My guage is reading about 50degF lower than the IR pointed at the same location on the manifold at idle. I havent figure out how to strap someone to the left frame rail underneath the cab in order to check it under load. Assuming that the error is linear, that's close to 15%, which at 1200degF would be 1380 actual.
Also, I have an Autometer guage, which I have come to realize is junk. I have 5 Autometer across two vehicles, and I believe they are all just the cheapest crap available. Next time I am getting a different brand.
You know another thing could be the gauge. I don't know how we could check it though. Maybe somebody else here has figured that one out.
[/ QUOTE ]
I checked mine with an Infrared non-contact thermometer from Sears. My guage is reading about 50degF lower than the IR pointed at the same location on the manifold at idle. I havent figure out how to strap someone to the left frame rail underneath the cab in order to check it under load. Assuming that the error is linear, that's close to 15%, which at 1200degF would be 1380 actual.
Also, I have an Autometer guage, which I have come to realize is junk. I have 5 Autometer across two vehicles, and I believe they are all just the cheapest crap available. Next time I am getting a different brand.
