I found some good info at this Japanese(translated link) site for the CIMA which had VG30det .Has info for Early and Late models, series 1(red covers),
mine is series 2(silver covers) . ECU PINOUTS for ecu with 4 separate plugs(early) AND ecu pinout for ecu with one large Blue plug(late) same as z32 etc
plus info on other sensors etc .well worth a look for VG30DET info
https://translate.google.com/translate?depth=1&hl=en&prev=search&rurl=translate.google.com.au&sl=ja&u=http://www.geocities.jp/blue31cima/index.htm