I've had mine relocated for quite some time without issue and my car has the sensitive AEM 1052 ecu. I placed a 100amp fuse on the power wire but near the battery, as that's where it can work best. I have a 4 channel amp powering a good little sound system and not once seen lights even dim. To connect the stock wires to the new one you can use.....

https://www.mcmaster.com/#8031K51

Compression butt splice. The ones they sell you can get sized for whatever wire you used. And not to sound like a mcmaster salesman, but this wire has been so nice.

https://www.mcmaster.com/#6948K95