@kats Here is a Jan 1971 240z on first drive after a rebuild with stock sender and gauge. The oil pump is a turbo with the spring shimmed with washers to increase pressure.

Hi Blue , thanks ! Is there any chance you would trade your 140 switch for my NOS 90 switch 89901 ? 

Kats

? It is not my switch.  Hovered.

But I have some early 1969 240z engines that may have the 140psi senders. I have to check them. Do you need a new one or will a used one that functions do the trick?

I would like to have a new 140 one for my S20 . I have some used 90 ones and 140 ones . 

Thanks ! 

Kats

5 minutes ago, kats said:

I would like to have a new 140 one for my S20 . I have some used 90 ones and 140 ones . 

Thanks ! 

Kats

OK I'll try to find one. Ebay only has this substitute currently:

https://www.ebay.com/itm/MANUFACT-GEN-Engine-Oil-Pressure-Switch-25070-89972/272853013165?epid=140384145&hash=item3f874e92ad:g:VMkAAOSw4Z5aMHt6

 

15 hours ago, kats said:

I forgot to put this , my 1972( 12/71 made ) Datsun 240Z . I think a 6kg switch cooperated with a 6kg / 90lb scale work pretty good, it makes me feel happy .

Kats

Hi Kats,

I am glad that my experience with a car originally purchased new on 3/25/71 helped confirm the reasons

a redesign of the oil pressure gage/sender combination was needed.  I had used the 90psi/6kg combination

with the good results that you describe, but I needed to use the 140psi/10kg combination to retain the originality

of my series 1 car.  During periodic maintenance, my mechanic, who has worked on these car since the mid

1970s, confirms my oil pressure with a direct reading gage knowing that this was a problem from the start.

It also, as you say, gives me peace of mind.

Sorry, I am no help when talking about S20 engines in Z432 cars, but wish I had this Z432 problem.  ?‍✈️

Dan