Sorry to hear your wake up tool is not working Navy but just to clarify, did you try a new battery in it, does the green light flash when you hold the button or the red, are you holding it at the labelled area on the rim with bike ignition on? Also I find I have to hold the button for a while sometimes, like 30 seconds or so.
I have found the readings to be very close to my calibrated gauge but on three different bikes the readings do vary by about 0.1 bar.
Although the readings are temperature (20 c) they are not altitude compensated so if you set them at sea level and go up to say 2,000 meters you can get a change of maybe 0.3 bar but if you set them at high altitude they will show the correct pressure at that height as the reading is just the difference in the external and internal pressures.
While I am writing this I see other posts coming in so to respond to the latest the reading on your bike stays blank till the centrifugal switch is activated at about 30 kph (or the wake up tool wakes it up).
I believe the Ford unit is EL-50449