good luck! There is no OBD port on a vehicle that old
That would be the OBD I Diagnostic Connector.
OBD1
Should be OBD I, OBD II is 1996 and newer
That would be the OBD I system and the connector would be found under the dash, drivers side.
OBD II came out in 1996 and up.
It has TBI / Throttle body injection.
I can't find the connection point for a tachometer on my 1988 Chevy S10 with a 2.8 L engine.
94 should be OBD I.
autozone.com
Find the s10's ac drier. On the side of the drier there is a port. This is the low pressure ac port.
A code reader that will work on the OBD I system.
System too rich bank 1