Brand: Stack Inc
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The Stack ST400 Professional Tachometer uses microprocessor controlled stepper motor movement for rock-steady, no waver operation throughout the RPM range. This technology also permits the dial to be compressed at the low end and expanded at the high end for more accurate reading in the engine's normal operating range.
All ST400 models include 25 minute recording for on-tach playback, a tell-tale function, backlighting, switch kit, external shift light, wiring harness and complete instructions. Mounts in an 80mm (3 5/16 inch) opening. The bezel diameter is 3.47 inch.
Stack ST400 Manual