05 9990 eagle electrical issues

[3406E]

Hey guys. Where do I start

1.A couple days ago my speedo sensor went bad again that I changed November.
Issues: cruise don’t work, occasionally delayed throttle response, speedo needle doing gymnastics

2.breaker Fuse F8c keeps chipping started last night
Issues: dash lights/Instrument cluster lights / truck marker and lights all go out at once after I reset the breaker fuse. Note; they don’t go out if the truck is sitting but as soon as I drive off the fuse chips.diff lock light indicator in the dash keep coming off and on for no reason. Hazard and trailer stopped working just now as I am about to back up on a dock

One thing to add I did notice my voltage instrument needle surged more than usual a while ago.

I replaced f8C with with a reg fuse, fried it instantly so I put back the breaker

Truck: 05 9990 eagle - isx
And yeah I know international is notorious for these ghost electrical issues