What's your gauge reading range? I got a remote kit on my AE86 and i put the sensor before cooler(rx7 FC3S oil cooler). I just got a water temp gauge as oil temp gauge which will read max 120'C.
Normal driving is ok which only about 70 max after a long day, but on the track, 120'C is not enough.
gauge just max out so i don't know the actual oil temp.
I got a proper oil temp gauge now which will read up to 170'C but haven't replace with the one on the car.
Was thinking to use the 120'C gauge for after cooler and 170'C gauge for before cooler....but then i'll have too much gauges on the car...
Just for FYI, oil from sump goes to oil filter then to the rest of the engine. So putting guage after cooler maybe is a good idea since you then know what oil temp the engine is running and how well the cooler is working etc. But then you don't know the oil temp after engine. engine oil start to fail at high temp, i forgot the range....