Well, and here I thought gauges were a good thing... but all I'm getting are poking comments! :-laf
On the dash are the common 3: EGT, Boost, and Fuel Pressure.
On the Pillar: Rail Pressure
On the column: Oil Temp and Pressure
Overhead: Drive pressure, Front Diff, Trans, Rear Diff
Now that's not all that bad, is it?
I plan on keeping this truck for a long time, and more information about the truck can lend toward longevity and diagnosing problems that would otherwise go unnoticed... besides that fact that EGT, Boost, Fuel Pressure, Rail Pressure, Drive Pressure, etc are very helpful in tuning. Or maybe it's just the mechanical engineer in me.
I work at Oak Ridge National Lab's National Transportation Research Center in Fuels, Engines, and Emissions Research. As such, we often get small projects where time can't be justified for using one of the dyno cells; accordingly, some projects, where applicable, are performed on my truck real-time during normal driving... thus the need to be able to watch things a little more closely than some deem necessary.
Of course a rough set of analog gauges in no way compares to the vastly complicated data acquisition systems used for full monitoring, but they have proved beneficial. More plans for monitoring are in the works as time permits, such as a "timing gauge". On the stationary platforms, it's interesting to use a current probe on an injector signal, correlate with a shaft encoder, hook up to a scope and be able to see pulse width, duration, absolute timing with reference to TDC, etc. I would like to package this a little differently, and be able to monitor timing on my truck as well.
And, yes, Jesus is my God too! --Eric