With this conversion harness you can connect a OBD1 ECU
     (i.E. P06, P28, P30) to a OBD2 Wireing Harness. This is helpfull when in
     a OBD2 car a strong modified engine is installed (or a engine swap was
     done) and the ECU need to be matched or tuned to this engine. OBD2
     ECU's are not easy to chip or when, only with a lot of money. OBD1
     ECU's are easy to chip, so this conversion harness is cheap alternative
     to the expensive OBD2 chipping.
 
     Please take care to order the right conversion harness for your use.
     OBD2a uses the plugs A,C,D and OBD2b the plugs A,B,C.