Collecting temperature & pressure

Got a small board measuring pressure and temperature:

the PCBs are (L to R)
temp/press/altitude monitor
GPS
microSD card board
compass unit (not much good)

Arduino sketch for the temp/pressure chip works fine, sketch for GPS works fine, but I'm struggling to merge them so that it can log both

Then, might be worth logging everything to SD card as well as sending the data to be transmitted