I have been part searching for an alternative to the 94' and under oil pressure sending unit. For anyone with a bad sending unit or swapping to a real pressure gauge it's getting hard to find one and if you do it's very expensive. The closest I have found is from a 260ZX / 280ZX with analog gauge.

Part #
Standard PS153 or search UPC# 0091769020736
BECK/ARNLEY 2010239

It is the correct 1/8" BPT thread
Ohm wise it's very close

Pressure to sending unit - Gauge reads
35psi - 30psi
58psi - 60psi

It has a pin connector instead of a blade terminal so I just solder a crimp blade onto it.

Sending unit on the left is OEM mazda 94 and under and the one on the right is the PS153

 

This is an excellent piece of information, thank you.

I've copied this into the "Useful Saved Posts" forum.