TM 9-1829A, April 1944 23/100 2021-07-07
Chapter 4: Auto-Lite speedometers and tachometers
Section I: SPA series
10. Description
a. This is a double-magnet type with hair spring mounted above the front jewel bracket, right-hand gears, and
odometer mounted below the center of the dial. For complete description, operation and test procedure refer
to previous paragraphs 2 and 4.
Figure 24: Auto-Lite speedometer (SPA-type), disassembled
11. Disassembly
a. Remove bezel: Cut bezel with side cutters (fig. 51). Remove (fig. 52) and discard bezel, then remove glass
and dial.
b. Remove case: Remove two screws and lock washers from back of case and lift out main frame assembly. Do
not lose dust washer between main frame and case.
c. Remove pointer: Remove needle-type pointers by holding pointer hub with fingers, twisting gently
counterclockwise, and pulling off staff (fig. 78). On disk-type pointers hold speed cup from turning, and
gently twist pointer from shaft.
d. Remove dial: Remove two small screws from dial (grasp screwdriver firmly to avoid accidental scratching
of dial.)
e. Remove odometer (fig. 25): With screwdriver, remove bearing plate screw and locating plate screw. Take
off bearing plate, locating plate, and odometer.
Figure 25: SPA-type speedometer mechanism (dial removed)
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