Has anybody replaced the oil pressure gauge on on mk 2.5 with one that actually shows the oil pressure rather than the on/ off OE item?
See
https://www.miata.net/garage/opg2/index.html
https://www.miata.net/garage/opg2/Oil_Sender.htm
http://wiki.miata.net/tiki-index.php?page=Turning+the+NB+Oil+Pressure+gauge+into+a+real+gauge
https://www.miata.net/garage/opg.html#Drake%20Daum
Copy and paste this into your search bar buddy…
http://www.mazdamenders.net/forum/viewtopic.php?f=41&t=6760
M-m
I think its best not to know, within reason.
My Lotus engined Seven has a Smiths pressure gauge, as its in keeping with the car, and it worries me to death.
Depending on engine temperature and revs it reads anything from 80 down to 15 psi. Old and new oil yet more variation.
It’s like watching a bomb ticking away, not knowing how long the fuse is.
Imagine if fitted to newish cars under warranty… mine reads 75psi but my mates reads 85. It would be chaos.
Paul G
Its notable that on the motorsport-focused M2-1001 Clubman, that Mazda opted to delete the allegedly “real oil pressure gauge” in favour of a simple oil pressure warning light.
My 93 gauge behaves in the same fashion. Nothing wrong with the engine, but a failing £300 sender unit (yes, those early sender units are expensive).
2kg/cm2 at a steady 70mph cruise, then at 1:55, its like someone has flipped a switch. Connectors are clean.
Then you have a look whats inside a 89-94 sender unit:
Its mechanical, and sits in an area where its heated, covered in oil, has poor sealing (silicone?). After nearly 30 years, its probably not a surprise if a spring weakens, or a linkage stiffens.
Listening to your engine will tell you enough.
Phoenix22
PM sent with some useful info and advice for you buddy.
M-m
Cheers for all the info, will have a look into it as I think if it has an oil pressure gauge then it should work as an oil pressure gauge. If not then they may as well just put a clock there & an oil warning light.