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If your car uses the CAN-bus system it is possible the system must be told it has a new fuel pump and gauge unit fitted before it will work.
Any codes connected with the instruments can't be read on a normal obd2 scanner or code reader and altogether more dedicated equipment and software is needed for car and chassis systems. Obd2 is only for things that will or are likely to affect tailpipe emissions.
Buy a cheap OBD2 tester (about $35) and plug it in to your vehicle to show trouble codes and sensor values. Codes can then be cleared from computer to turn off check engine light. The OBD2 plug has to be with in 3 feet of steering column on all OBD2 equipped vehicles.
Most consumer available scanners read OBDII on 96 or newer vehicles. If your car does in fact have a OBDII plug then all you need is the software in your scanner to be able to read OBDI codes...a 95 is running OBDI. Advance Auto or Autozone might have a OBDI compliant scanner for free...just tell them you have the OBDII port so they don't take up all your time digging for the adapter!