TM 9-1829A, April 1944 34/100 2021-07-07
Section III: SPK, SPP and SPR Series
19. Description
a. The SPK speedometer (fig. 37) is a single-magnet type with hair spring mounted above the front jewel
bracket, odometer mounted above center of dial, trip odometer below center of dial, and with revolving field
plate. Dial is black with white figures reading from 0 to 60 miles per hour. Pointer is needle-type and is white.
Trip odometer reset is the solid-rod type.
b. The SPR speedometer (fig. 37) is a single-magnet type with the hair spring mounted above the front jewel
bracket, odometer mounted above center of dial, trip odometer below center of dial, and with revolving field
plate. They have needle-type pointers and flexible reset shafts.
Figure 37: Auto-Lite speedometer (SPK- and SPR-types), disassembled
c. The SPP tachometer (fig. 38) is a single-magnet type with the hair spring mounted above the front jewel
bracket. Total odometer is mounted below center of dial. It has no trip odometer and no reset assembly. For
complete description, operation, and test procedure refer to paragraphs 2 and 4.
Figure 38: Auto-Lite tachometer (SPP-type), disassembled
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