What is the purpose of using two gauges during installation?

Using two gauges during installation primarily serves to reduce gauge failure. By utilizing a second gauge, operators can verify the readings of the first gauge. This redundancy is crucial in applications where precise measurements are necessary, such as in fuel system installations. If one gauge were to fail or provide inaccurate readings due to environmental factors, mechanical failure, or calibration issues, the other gauge can serve as a fail-safe, ensuring that operators have a reliable measurement to work with. This practice enhances safety, reliability, and overall operational integrity by providing a backup measure, which is particularly important in critical installations like underground storage tanks where proper monitoring is essential for compliance and preventing leaks.