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"The Pyrometer is the most important gauge a turbocharged diesel engine can have. Pyrometer readings allow the operator to constantly monitor the engines "safe zone" of operation. The exhaust temperatures are monitored with a probe inserted into the exhaust flow. The probe can be mounted pre-turbo or post-turbo. PDR strongly recommends all probe tips be installed pre-turbo. Pre-turbo temperatures of 300° F to 1200° F will be normal working levels. Temperatures above these levels can only be reached for very short times ( 10 - 20 seconds ) or engine damage can result. "........... As a guide line.. Engine spec's will differ some....but not much..
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