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The tachometer drive circuit (part of the main circuit) receives pulses from the PCM. The solid-state tachometer then displays these pulses as engine speed. For each 200 pulses per minute from the PCM the tachometer displays 100 RPM.
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Tim Poliniak | Internet Parts Manager
Ray Laks Honda/Acura | www.hondacuraworld.com | Toll-Free 1-888-RAY-LAKS
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