Reusing abs sensors, wires, lights

On the left is the pinout of two primary ABS connectors (S15 and S16). If your goal is to reuse these wires, wire the sensors into your engine management, or connect to the lights that are on your gauge cluster, you'll be using these pins. The only major exception is the TRAC-OFF switch wire which connects to connector S17. The device and pin they used to connect to is listed below on the S17 connector. Other than this, the majority of the wires that feed into the engine bay connect to connectors S15 and S16.

The GREAT NEWS is that these two connectors are also used on several K Series Honda applications & NB Miata. Which means you can buy a header panel like the one pictured below, connect your wires to the wheel speed sensors, gauge cluster lights, and whatever extra you have in your engine bay after you pull the wires from the ABS actuator plug, then plug in these two plugs to the header panel below. That's it! This is especially exciting since the ABS ECU connectors are highly difficult to crimp and heatshrink (due to their location under the dash).

19 of the wires in the graphic on the left go straight from the ABS ECU to the engine bay.

Part numbers:
90980-11421 S15
90980-11476 S16
89540-53150 ABS & Trac ECU

Picture below is from ebay. You can search either "NB ECU header" or "K series ECU header" and you'll find listings. Ballenger Motorsports has a header panel as well that is more expensive, but likely better quality than this ebay picture below.

If your goal is to repurpose the wires, the below graphic shows the wire routing in the engine bay that can potentially be used to connect to whatever you want to conenct them to. If you extend these 
wires using the above pin guide you can potentially wire them to your engine management, PDM, or whatever other device you have. As stated above, connectors S15 and S16 on the ABS ECU are also used on a Honda, and the pin header can be purchased online. The pin header can be used as a jumper to connect to an engine management so most of the wires going through the firewall can be repurposed as engine sensor wires. So a flying lead harness doesn't necessarily need to be used.

Regarding the fuses, there is a large cartridge fuse (60 amp) that feeds the ABS MTR and ABS SOL relays and there's a small 7.5 amp fuse that powers the ABS and Track ECU. The outputs for these relays are in the diagram below (MTR power output is blue with a yellow stripe,  SOL power output is blue with a white stripe). Wire colors: Blue w/ yellow stripe and blue w/ white stripe. You'll need to trigger the relays with the smaller wires that are mentioned in the paragraph to the right. The 7.5 amp "ABS 2" fuse is technically "downstream" from the ABS relay, the power for this fuse is routed through the ABS module (block)after it receives power from the ABS MOD relay and feeds that power back to the fusebox via the Yellow wire. The yellow wire with the red stripe feeds the ABS and track ECU power. This is a 16 AWG wire, so consult how much amperage can be pulled through it before you power something. Use the appropriate fuse.
**If you remove your ABS module from the engine bay your ABS ECU will not have power.

Considering you've removed the ABS system, you'll have a 60 amp fuse that feeds two relays that you can take advantage of. The positive trigger for both relays to be powered on (coil) is the blue wire with the black stripe. The negative wire for the ABS MTR relay is red with a yellow stripe, and the negative wire for the ABS SOL relay is blue with a red stripe. Consult your wire diagram for more detailed information regarding the relays, fuses, and wires.

ABS pin S15-10 (blue wire with red stripe) SOL relay ground controlled by the ABS ECU.
ABS pin S15-24 (red wire with yellow stripe) MTR relay ground controlled by the ABS ECU.
ABS pin S15-1 (blue wire with black stripe) is both the SOL and MTR relay positive from ABS ECU.