If you look at the zoomed out picture of the speedway 12 circuit harness, you can see where the flashers are:
https://www.speedwaymotors.com/12-Circuit-Mini-Fuse-Universal-Hot-Rod-Wiring-Harness-Kit,2352.html
Instead of being part of the fuse block itself, they are on remote wires so you can mount them someplace more convenient.
As far as a USB port, I would strongly recommend putting in a cigarrete lighter and using usb chargers that plug into that. I did the integrated USB port back when all phone chargers did was supply 5VDC to the +/- pins in the port. Those quickly became obsolete as more and more of the charge circutry moved from the phone to the charger. Now that USB C is becoming the norm, they are even worse.
With a cigarrete lighter port, you can just pop in whatever the current charging technology is and go.
Last edited by Fibonachu; 02/19/2022 5:12 PM. Reason: Added usb port info
