Redline Detection's replacement Compound Pressure Gauge is designed for pressure and vacuum measurement by utilizing a 2.5 in dual scale dial. The center back mounting is ¼ in. Compatible with: Smoke Pro Total-Tech Part No. 95-0003/B, 95-0003/A, 95-0003, Mac Tools Leak Attack Part No. EV9510B, EV9510A, EV9510, Matco Tools Diagnostic Leak Detector Part No. KI95-0014B, KI95-0014A. KI95-0014, Cornwell Tools Diagnostic Leak Detector Part No. RL950012B, RL950012A, RL950012, Proto Tools Diagnostic Leak Detector Part No. JFP9510