No problems if you know what you are doing. The main trouble area, if you don't know what you are doing, is going to be coupling the escort loom to the Sierra column switches (is that what you are using, you didn't say?).
Another problem will be to ensure that the rear fog light only comes on when the headlamps (either dip or hi beam) are on, and that the switch lights up when this happens, and not at any other time.
Premier looms (probably the main supplier) use a relay to achieve this.
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