Look at the back of your Delphi interface. You will see a label that says or similar. The "Rev 1.0" indicates the PCB and firmware version. This is important because newer revisions (e.g., Rev 1.6) use different drivers. Attempting to install Rev 1.0 drivers on a Rev 2.0 device will fail.
First, a hard truth: Delphi (now part of BorgWarner or Aptiv, depending on the division) rarely releases public drivers for legacy OEM or engineering sample hardware. The “100 251 Rev 1.0” doesn’t appear in mainstream driver databases—because it was likely never meant for end users. This number could be an internal PCB assembly code, not a product model. Delphi 100 251 Rev 1.0 Driver Download
Searching “Delphi 100 251 Rev 1.0 Driver Download” leads to sketchy EXE-filled pages. No official driver was ever packaged under that exact name. If a site claims to have it, it’s likely malware or a generic driver renamed to trap you. Look at the back of your Delphi interface
Once you have downloaded the driver: