This harness is a temporary way to make the old red switch reasonably safe to continue using until more of the black switches become available. See the FSA:
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List price on this is ~$11 (as of the date I posted the pic), but it will be installed at NO CHARGE (parts or labor) on vehicles covered by the recall. Even though the label is wrong about the fuse being internal, it should still NEVER be replaced. If it blows, it means the brake pressure switch is leaking, and (as the label states) should be replaced with the new switch & adapter harness kit, listing for ~$20 right now.

Q1. What is the Universal Fused Jumper Harness?
A. The Universal Fused Jumper Harness contains a fuse in each side of the circuit to accommodate polarity complexity across vehicle lines, and a connector hardshell that is compatible with all Speed Control Deactivation Switches.
Q2. Why are the Speed Control Deactivation Switches not interchangeable on all vehicle applications?
A. Differences in Speed Control Deactivation Switch (SCDS) activation pressures make it essential that the correct SCDS is installed in the specified vehicle application.
Q3. Can I just remove the fuse for the Speed Control System circuit?
A. No. Removing the fuse will disable more systems on the vehicle than just the Speed Control System.
Q4. Can the customer disconnect the Speed Control Deactivation Switch connector?
A. No. To ensure that the correct connector is disconnected, a dealership technician should perform this service.
Q5. Is the Speed Control Deactivation Switch located on the vehicle steering wheel?
A. No. The Speed Control Deactivation Switch is typically mounted to the brake master cylinder under the hood. On some of the earlier built vehicles, the SCDS was mounted to a junction block or brake proportioning valve located below the master cylinder on or near the frame rail.
Q6. Can customers avoid overheating the switch by not using the Speed Control System?
A. No. The electrical circuit to the Speed Control Deactivation Switch is always energized, so not using the Speed Control System doesn't reduce the potential for overheating of the switch.

For other TSBs, check here.

Owner caption December 2005 · Photo 1085 of 5000