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FWIW I believe our GU wagons Redarc 3in1 (boost/EGT/water) is most invaluable. Audible alarm add on and settings makes for a lot less visual stressing too. Still currently relying on factory oil pressure light but one day when coin permits would like to add one extra 3in1 gauge onto the dual pillar pod too.
Reason I believe water monitoring is so critical on the 4.2 diesel engines is that Nissan’s factory gauge found having owned quite a few of them do have a deliberately designed in let’s call it a ‘dead spot’!
The factory needle will sit from my experiences found at a whisker below half way on a huge range of approximately 70C < > 105C IIRC.
If your 4.2L GU factory gauge is nudging towards ‘H’ it’s generally almost over and your system needs serious assessing or backing right off the peddle ASAP!
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