I have decided to use the gauges. The greddy guage DOES fit, it's just slightly too long to fit completely flush. You can't tell unless you look as you open the door and look to the inside. It actually positions the gauges (oil pressure is slightly too long also)at a better angle. I'll post pics when I have it completed so that you can understand better what I am describing.
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'97 200SX SE-R
JWT ECU, Place CAI