TM 10-3930-671-24 (2) Installation. NOTE All four lamps in the warning indicator light cluster gauge are installed the same way.  Engine oil pressure lamp is shown. (a) To install lamp (9) in warning indicator light cluster gauge (10), proceed as follows: 1 Install lamp (9) in socket (11). 2 Install socket (11) in warning indicator light cluster gauge (10) and rotate socket (11) to the right. NOTE Lamps in fuel gauge and transmission temperature gauge are installed the same way.  Fuel gauge is shown. (b) To install lamp (6) in fuel gauge (7), proceed as follows: 1 Install lamp (6) in socket assembly (8). 2 Install socket assembly (8) in fuel gauge (7). (c) Install plate (4) on instrument panel (5) with two screws (3), washers (2), and nuts (1).  Tighten nuts securely. (d) Install instrument panel (Para 3-36). (e) Connect batteries (Para 3-25). 3-56