Electric Brake Vacuum Pump Switch + Relay for Vacuum Pumps (28146 or Others) Upgrade your brake vacuum pump system with this high-performance vacuum switch and relay kit, designed to work with a variety of pumps, including 28146. Engineered for durability and reliability, this switch and relay set ensures efficient operation and long-lasting performance. Key Features and Benefits Vacuum Switch Specifications: Operating Range: Functions seamlessly between 15-28 inches of vacuum. 100% Tested: Each unit undergoes rigorous testing to ensure reliable performance. Relay Specifications: Improved Design: Upgraded for a stronger and longer-lasting relay operation. 100% Tested: Ensures quality and dependability. Compatibility: Works with 28146 pumps and other similar vacuum pump systems. Relay Wiring Instructions: #1: Connects to the vacuum switch wire. #2: Connects to power (12V hot). #3: Connects all grounds, including power input and vacuum switch ground. #5: Connects to the ground from the motor. Important Notes: Ensure power is off when connecting parts. Use an inline fuse for added safety.