TM 9-2320-361-34 3-18. ENGINE REPLACEMENT (Contd) 46. Connect tachometer driveshaft (25) on tachometer drive unit (24). 47. Install tachometer driveshaft (24) and clamp (26) on bracket (28) with screw (23) and new locknut (27). 48. Install wiring harness (29), tachometer driveshaft (25), and four clamps (20) on two brackets (21) with two screws (22) and new locknuts (19). 49. Install inlet hose (30) and outlet hose (31) on hot water personnel heater (33) with two clamps (32). 3-75