TN 65215 Hydraulic Oil Level Sensing Gauge for Tennant Sweepers and Scrubbers. Located on the outside of the hydraulic reservoir tank. Fit models: 800, 800D, 810, 810D, M20, M20D, M30, M30D, T20 and also as an option on Tennant 8410/8410D. Priced Each. Replaces Tennant 65215. Our Part Number TN 65215