Quoted directly from the Banks Sidewinder Owner's Manual:
"Your Banks Sidewinder turbocharged diesel engine should exhibit the following operating characteristics: Cruise Conditions (constant 60mph on Level Road): EGT should be approximately 400°F to 600°F; boost gauge, if so equipped, should read 1 to 2 pounds. High Load Conditions (uphill with heavy load): EGT should typically be 900°F to 1000°F, with 1050°F as a safe maximum. It is important to realize that diesels, unlike gasoline engines, run cooler with additional air. Exhaust gas temperature rises as more fuel is added. Turbocharging a diesel typically lowers the EGT. Normal cruise condition EGT for a normally aspirated (non-turbocharged) diesel engine is typically 600°F to 800°F. As noted above, cruise condition EGT for a turbocharged diesel is typically 400°F to 600°F. This lower EGT translates directly to lower piston and valve temperatures, and significantly increased engine life. It is also important to understand that turbocharged boost pressures are load related, that is the turbocharger makes boost only when called upon to do so (by load requirements). The turbo will not “make boost” with the transmission in neutral, but makes boost proportional to the load. Long uphill grades, with a heavy load, will result in maximum boost. In other words, the turbo makes boost only when it is needed. This characteristic makes turbochargers so attractive that the vast majority of long haul trucks and off-road earth moving equipment are equipped with turbochargers. Turbocharging typically results in more power and torque, better fuel economy and increased engine life."
But, as other mentioned, you have to take those numbers with a grain of salt depending on your probe location. Banks' probe is over by the turbo, so if you're measuring in/at the manifold, your numbers will be a bit higher. Exactly how much is unknown, but I've heard the numbers at the manifold can read 150°-300°F higher than where Banks measures.
Mike
