Originally Posted by CdnoilRAM
The EGT might not be a bad idea then if you're doing heavy hauling just to keep an eye on temps, but you'd be wasting your money on the turbo timer.
Unless tuned, the EGT gauge is pretty much just for personal reference. the stock tuning will not let it get hot enough to hurt anything. BUT with the EGT gauge, you can tell if it is in regen. and the computer DOES have EGT sensors (for emissions purposes) but they are quite a ways downstream from the turbo to be useful for protection purposes.
as to the turbo temp monitor, having a water cooled turbo kinda negates the need for one. the water will keep circulating after shutdown to carry heat away from the turbo.as long as you don't run the crap out of it and immediately shut down, you will be fine.