This is a obd0 to obd1 distributor harness plug adapter for MPFI obd0 engine harnesses.
This will prevent you from having to complete any wiring at the distributor when doing an obd0 to obd1 conversion to run an obd1 ecu.
Re-wiring old obd0 harnesses at the distributor can sometimes cause ignition problems, hence the release of this product!