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MAP testing

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Old 09-28-2009, 01:10 PM   #1
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Default MAP testing

well im trying to test my map, 1990 4.9, the book says a need a digital meter with frequency setting. that i dont have, i saw a digital meter at checker, $90.00 that says frequency is also on it. any one bought one of these are which one would you recommend. i really dont want to spend a arm and a leg to get one but then it is another tool to have.
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Old 09-28-2009, 01:54 PM   #2
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i tried my digital dwell tach meter. says to set to 6 cylinder and probe the backside mp/bp, says i should get a reading of 310 rpm, what i see is 32.0 and when i put a vacuum it will go down to 31.0, books says it should go down to 200 rpm
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