plug on obd1 and 2 are different
a d won't fit int a b tranny, and vice versa, but the plug is the same (for the obd anyway)
obd0 are entirely different- use a different plug, output a different pulse width, and will not work with obd1/2 ecus. the converse is also true- you cannot run aon obd0 ecu with an obd1/2 vss.