I own a R1250gs. The tire pressure listed on the back of the owners manual states my front tire should be inflated to 36.3 psi and my rear tire to 42.1 psi. I have a pretty expensive digital tire pressure gage and I monitor my tire pressure to make sure they agree with the recommended inflation pressures. However, the tire pressure monitor/warning system on my bike consistently reads lower than my tire pressure gage. I tried a different tire pressure gage (not so expensive) and the tire pressure monitor on my bike disagrees with that one also. Should I trust the tire pressure monitor/warning system on my bike, or my tire pressure gage?