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Maruti Suzuki alto car is a 800CC 3 cylinder engine car. it’s a manual drive car , so i need to fix RPM meter for it because it doesn’t come factory fitted RPM meter. So i have searched ebay and local market to find suitable one. unfortunately there is a no rpm meter for 3 cylinder. each rpm meter has 4 , 6 , 8 cylinder capacity levels. So here i have made custom RPM meter using Arduino based electronics”

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