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Hi there, realise you're a CRD but I've got a oil pressure gauge installed on my '04 Trol. Just plumbed into the same point as the low oil pressure switch using a T-adaptor (rear left side of engine from the driver's point of view, just behind oil filter).
Much easier to fit with engine in situ than the point for the high oil pressure switch/oil pressure sensor. Even easier if you remove the oil filter + housing first. Readings are fine from the low pressure switch point and I believe thats also where the Nissan techs fit a pressure gauge if they need to check.
My gauge is just a TIM 100psi gauge which works fine for the rev range I work in (up to 3500 maybe 3750).
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