ejb2112, a better question to ask before you go worrying about what value everything should be is what parameters are even important?
I don't live monitor HPFP actual pressure at all. I have upgraded internals, so if I'm not meeting targets, one of two things is going to happen: ZZB, or I won't accelerate at all. I use WOT logs that I take periodically to check up on my HPFP...and haven't seen a single problem since I installed my autotechs.
Here's my top 10-ish list of parameters to monitor, in alphabetical order:
1) AFR - When I go WOT, especially when I'm running a methanol/ethanol mix, I'll periodically verify that I'm achieving my target AFR (11.5 at WOT, 14.7 or 17.0 depending on what map I'm running at all other times). Too rich or too lean, something's wrong and I need to sort it out ASAP. Going mega rich at WOT when SWAS and TCS are disabled are the classic signs of a boost leak. Too lean at WOT is usually a tuning issue, but can also be caused by a bad flash of a map in my experience.
2) Boost - This is good to monitor to watch out for boost spikes, and boost leaks. It also tells me at a glance how cold/hot the temperatures are outside since I'm load tuned, so the ECU will add/subtract boost to meet my target loads. When it's really cold outside and I see boost go really low, I know I might be getting close to territory where the wastegate dynamics system will run out of ability to adjust WGDC enough to bring my calculated load down. At this point I'll usually massage the WGDC table a little bit to make sure it has room to adjust so that my load targets aren't exceeded (you can also recalibrate the IAT Comp table).
3) BAT - This is a good one to live monitor when you're running a gas tune. Personally, I just don't go WOT when my car is heatsoaked and I'm running gas. It's going to knock no matter what.
4) Calculated load - This parameter is equal to mass airflow divided by RPM times 40. It it directly proportional to torque output. I monitor this parameter at all times since any deviation from my target values at WOT can mean either a catastrophic overrun of torque, or conversely, significant loss of power. This parameter will vary car to car depending on power level, turbo, etc. In general on the stock engine I don't like to see calculated load values of more than 2.50 at low RPM's, however on a spike-happy K04, you may see higher than this in the 3000-3500 vicinity and in this case you should reduce timing in this vicinity for safety.
5) Coolant temp - Gen2 folks who don't have a coolant gauge should monitor this. If it's below 176 or above 217°F while driving, you probably have a thermostat issue. When cruising at normal loads, it should nominally be 190°F. Mine usually sits a little lower.
6) Knock Retard - This is the one you watch while at WOT, if nothing else. In my opinion seeing more than 1.5 consistently at WOT is unacceptable. The engine can handle a hell of a lot more than that (I've personally seen a 3.8 before at somewhere in the 2.20-2.30 calc load vicinity - the engine is still alive and well somehow!). Part throttle, you will see a lot of knock on gas tunes, especially when heatsoaked, and this is when I will usually try to take it easy until things cool off. On E85 or methanol mixes, generally it will be zero pretty much all the time unless your tune is really aggressive and you are well beyond your turbo and/or IC efficiency.
7) Fuel trims (long and short term) - Add these together and you will have your total fueling error. I like to see within +/- 5% at calculated loads above 0.30 or so, all the way to where it goes into open loop. If you see high values at idle, like say +25%, that could indicate a vacuum leak or pre-turbo intake leak. If you see really low values, especially as load increases, like -20%, that could indicate a boost leak between the turbo and the throttle body.
8) Throttle position at WOT - Watch for values that sit significantly below 74%-ish at WOT for a long time (more than 1500 RPM's or so). This means the load error comp system is really getting involved and your WGDC values are probably too high.
9) WGDC at WOT - This isn't one you really need/want to monitor, just one that you should always be comparing in your logs to your corresponding values in the WGDC table. Any significant deviation, after taking into account IAT, probably means you need to patch up your tune. Really high WGDC values combined with low calculated load values usually indicates a problem somewhere, either hardware (clogged cats/intakes, WG problems) or otherwise, as the ECU is trying to add lots of WGDC and still isn't reaching targets. Conversely, really low values could indicate a problem with your EBCS hardware, for example a leak in the lines between the turbo, EBCS, and wastegate, and this could be a serious problem.
This is not a complete list, just the stuff I feel is most important.
