I’m posting my configuration to hopefully remove some confusion / be helpful. This configuration has been ground tested and flown with ArduPlane 3.8.2.
Note: The sensor is connected directly to the I2C port labeled I2C 2 on the carrier board.
ARSPD_AUTOCAL 0.000000 ARSPD_BUS 0.00000 ARSPD_OFFSET 55.642334 ARSPD_PIN 15.000000 ARSPD_PSI_RANGE 1.000000 ARSPD_RATIO 1.627000 ARSPD_SKIP_CAL 1.000000 ARSPD_TUBE_ORDER 0.000000 ARSPD_TYPE 3.000000 ARSPD_USE 1.000000
Be very careful when changing the ARSPD_OFFSET and ARSPD_RATIO parameters. The values posed above work well for me but use caution when changing yours. Your sensor may require different values and getting them wrong can result in a stall / crash.