New to me 2017 Chrysler Pacific:
The TPMS numbers on the instrument panel are wrong (higher than actual 36 PSI in the tires) and they vary a little and they show up dimly compared to all the rest of the instrument panel. There is no flashing or other indication of a malfunction.
What’s likely wrong here? Simply low batteries in the sending units? Cost to repair?
how much of a discrepancy are we talking about?
and are you using a high-quality tire pressure gauge to determine the actual pressure?
Take the van to a tire shop and ask them to check the TPMS sensors and the actual tire pressure.
You may very well have some bad or dying TPMS sensors. I think they usually run in the neighborhood of $100 each, though I may be wrong. Might make more sense to just have the sensors replaced next time you get a new set of tires, but that could get annoying.
The sensors in my recent acquisition, a 2021 Mustang, are all reading high against a verified gauge. Generally it doesn’t matter at all if they are inaccurate. They will still flag a low tire.
Edit… maybe not so verified a gauge! I compared to a couple others in my toolbox, seems my gauge was low.
The warning may be relative to the other 3 or absolute pressure drop or absolute pressure reading, I am not sure. I plan to test it shortly!
I set the tires to 36 PSI cold. My new dial gauge, old pencil gauge, and the gauge built into the tire inflator at the end of my pressure hose all are quite close to 36.
The dimness of the readouts on the instrument panel, as well as the too-high and somewhat variable numbers, are the reasons for my question here.
Which really can’t be answered here or give any kind of a decent price .
How old is the 12V battery under your hood?
The dimness of your dash lights makes me suspect your battery may be on the way out.
How do you know which gauges are right? Have you reference any to a calibration standard?
I compared my well used tire gauge against other less used gauges in my tool collection. The tire gauge was the outlier when the other gauges matched.
I need to look for a service that has a calibrator. Or maybe make my own… math, a scale and a lathe
How important is pressure gauge accuracy for racing? If it is important, then calibration gauges must be traceable to a standard at, say, NIST or another standards organization.
Pressure is very important in racing but the number is not an absolute. Pressures come from the tire maker as a range. The optimum is determined by experimentation. If optimum hot temps were determined with a gauge 3 psi low it is still a valid record as long as that gauge is always used in a certain period of time.
Pros would calibrate their gauges to a standard regularly especially if the racing sanctioning body mandates a minimum cold pressure. All gauges on a large team should read identically. And errors at recalibration would cause the records to be adjusted so, yes, traceability would be important.
Even with that, typically there is one guy that is the tire guy for the team. Even if he has assistants he usually sets the pressures himself with his gauge for a 1 or 2 car team. Those pressures are usually only shared with the team engineer or chief mechanic for each car and no one else. Full secret squirrel.
Same in drag racing, guys running slicks and drag radials will adjust the final rear tire pressure at the water box right before the burnout, typically in 1/2 pound increments, like might drop from 12 psi down to 11.5 psi depending…
On my street tires on my fun car, if I plan on playing any, I drop them (rears) down to about 26 psi, if just plan on driving (rarely lol) I will run 35 psi.. I have a twin hose (single gauge) set up I made to air up 2 tires at a time so I have exactly the same amount in both rear tires no matter what the pressure…
This is the definition of accuracy versus precision. If I use the same gauge consistently and arrive at a number that represents best performance, it doesn’t matter if it is accurate or not. It just needs to be precise and give the same readings under the same conditions.
The problem comes in when that gauge stops working and have to switch to a backup…now the calibration to a standard becomes beneficial.
We have all kinds of fun discussions with customers about calibration standards…hey, our cal standard reads differently than yours! 
Has your psi display always been dim?
[quote=“shanonia, post:1, topic:199952”]
they show up dimly compared to all the rest of the instrument panel.
I just bought the car. Only the TPMS numbers are dim. Everything else on that display and all the other displays is bright.