Oil pressure guage install

Hi Everyone

I have a 91 corolla gls with the 1.6 4af carburetor engine (south africa) and I want to run an oil pressure guage (electric).
Any ideas or tips as to where I can install the sensor?
The factory oil switch location is behind the alternator.
I'm planning to hopefully run the oem switch and the aftermarket sensor together.
Any advice or products would be helpful .
Thanks