fuel rail earths, code 55 ? c20let

[ROG]

On the fuel rail earths i had heatshrink, peeled it back looking for anything causing my ecu light (code 55), and the wire is cut and then twisted together under the heatshrink
Easy enough to put a new connector on, but the wires a strange one, theres an inside wire and outside wire like on a tv aerial, it had the outer shielding part connected to the fuel rail , but looks more like it should be the inner wire as theres nowhere for the iner part to go, so to have an inner i presume its the one to connect

Does anyone know wether its inner or outer part to fuel rail?