Barometric pressure

[Lonestar10]

Since i finally found my Baro sensor wrapped in tape and hidden under the ECM area ive been wondering how much can it affect how the engine runs? ive been checking it in insite every so often when i stop for the night and comparing it to local weather readings and so far it always seems to be reading about 1.5 to 1.6 inhg lower than the weather like tonight in alexandria MN weather baro says 29.99 and my sensor reading in insite is 28.4.

is this enough drift to warrant replacement and what type of issues can this cause?

every other sensor on the engine is pretty much brand new " crank/cam position, IMAP, EGR Dif, Exhaust BP"