We can use OBD2 tools on those OBD1 cars got a OBD1 system which is part of OBD2 standard. ). (On Board Diagnostics - OBD has a very long history. One end for the 14 pin OBD1 connector on a Nissan, the other end for a 16 pin diagnostic tool.
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14PIN Adapter Connector For AUTEL Ms906/908 for NISSAN 14 PIN Connector
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For Nissan 14 Pin OBD1 to 16 Pin OBD2 Diagnostic Tool Adapter Cable Scanner US