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Z31 Aftermarket Gauge Information

The 1984 to 1989 300zx has a very good gauge package from the factory, even so, there is room for improvement. The following will give you the installation points to acquire the needed signals and adapters to run after market gauges.

*WARNING* - Do this modification at your own risk. We Are not responsable for any issues of your own doing.

Tools Needed

  • Metric socket set, extensions, and a ratchet.
  • #2 Phillips screwdriver
  • Small drill bit
  • Drill
  • Wire Strippers
  • Wire Cutters
  • Electrical Tape

Gauge Pods

Over the years there were many options for the Z31 for Gauge pods. Lo-Tec Used to make a Pilar with 3 pods for 52mm gauges in the Z31 but it has long been out of production. They come up sometimes on ebay bit that is rare.


Other Pilar options are from RMFG or you can modify one from an early Mitsubishi Eclipse to fit. Single Pods are Autometer part # ATM-20601 or ATM-20600 for the Dual Gauge Pods.


Some People also would replace the Factory center gauges with aftermarket units. These would be the 2 5/8″ size to look right without an adapter but you can use 52mm (2-1/16")As well with adapters.


Adapters can be purchased from The Z Garage.net

Procedure

Aftermarket Gauge Signal Reference

Gauge Type Signal Location / Adapter Needed Image
Narrow Band Air/Fuel Ratio Gauge Locate pin #24 on the ECU (solid black wire). You can also connect to the same black wire off the stock O2 sensor—just run it into the driver compartment.
ECU pinout
AF Gauge
Oil Pressure Gauge You will need a 1/8 NPT to 1/8 BSPT metric adapter to install this gauge in your Z.
Autometer part # AUM2269 		Oil Pressure Gauge
Tachometer Locate the blue signal wire off the coil and tap into this. Aftermarket Tach

Hope this helps with installing some gauges in your Z.

Sources Used