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Tach Signal wire location?

I have a 97 Tioga (E-Series Super Duty chassis W/ Trition V-10) I'm looking to install and after market Tachometer and need to find the tach signal wire (pink w/white strip) coming out of the ECU. But before I go tearing into this project, I'd like to see if any of you have attempted this and can advise me on the best way to proceed. And just were is the ECU located? Also does anyone have a labled diagram of the fuse block under the drivers side dash?
I do not have the owner manual for this rig and need to locate an ignition on source and the gauge light fuse for the afore mentioned Tach addition. Any help is greatly appreciated!
 

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