If you are seeing the following issues with the WIKA Gauge and Pulsa DP Sensor:

• Pulsa differential is reading lower than expected
• Pulsa differential is only reading ~75% fill at fills
• Pulsa differential does not match measure seen on WIKA

Please reference the article below.

• If activation of the DP gauge is done by opening the low side first before the high side the DP gauge may not read correctly upon initial activation of the DP gauge. The typical sign that the low side of the DP gauge was opened first is the DP gauge will read 75% even if the tank is full.
  
• To reset a DP gauge if improperly activated, isolate both the high and low side of the DP gauge circuit then relieve the pressure on each side of the DP gauge by loosening the fittings. Once the pressure is relieved and the needle drops to empty retighten the fittings and follow the activation step 4 above to properly activate the DP gauge.