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Message: <blockquote data-quote="subdude" data-source="post: 1853067" data-attributes="member: 544318">I have a 99 ford taurus (wifes car) I had installed a remote start system about 5 years ago. I'm upgrading the system but the old system used the voltage sense the new system requires a tach sense or positive voltage when running. I connected to the yellow/white stripe wire at the coil but the engine does not like it it will run rough. I can access the camshaft magnetic pickup wires but I do not know if that would work.  Has anyone had any similar experience or know of an alternative tach sense connection?  I'm sure any positive voltage when running will work.*update* I was poking around the coils &amp; found another true tach output at the 4 wire plug going into  the coils use the heavier White/ grey stripe wire. You can get a tach output without interfering with the ignition system.</blockquote>

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