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    How to use timing light.

    I bought a rotunda timing light for 6.9 on ebay. I followed the directions, but I'm not sure what it's supposed to act like. The truck is an 87 F250 4x4 with a 6.9 and 5 spd. First off, the luminous probe leaks so I have to hold the sending unit on or the air blows it off. I set it...

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