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Message: [QUOTE="Matt_P, post: 600984, member: 277"] The biggest issue with making it work by just splicing in is that the ford ECM and Dodge ECM require different frequencies for the tach, A 12v only sees 2 pulses per engine revolution which it takes off the harmonic balancer with an engine speed sensor mounted on the timing cover. Im pressure sure the 7.3 takes tach pickup from the CPS and I know the tone ring on that has a lot more than two marks so if you spliced it would have the frequency readings all mixed up and not read properly. The tone ring just ends up giving you the proper amount of pickups to recieve the correct frequency so then you can then just splice into the ford harness and recieve the correct pickup. It does suck to have to spend that much on something so simple though, the other option would be if you can figure out a way to convert the frequency [/QUOTE]

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