the CTS is from the 300zx but it's going to depend on which year RB20 he has. If his RB20 says "RB20" on the timing belt cover it's from the older Z. Search Nico or 240sx forums for which part #. it might be the dash plug wiring for the fuel and temp gauges.
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95 240sx RB20 415whp
91 Nx2000 VVL yo
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