Hi,
What are your plans? Do you plan to simply have the gauges in the car so you can check temps, etc. while out driving? Or do you want to use the values for tuning and/or data logging? If you're looking to do the latter (ie tuning and post-facto reviewing) then I would recommend from my own personal experience:
Wideband AFR: AEM UEGO as it can be directly connected to a PC via the serial output and used in NIStune for tuning purposes.
EGT: Most will be fine so long as they have really good heat shielding around the sensor and wire. I'm using a 60mm EGT gauge, so don't have a direct recommendation for a 52mm type.
Oil pressure/temp: The Pro Sport range of premium gauges are very good for data logging purposes. They have a wide resistance range which results in accurate data logging. I have determined all the temp/pressure values as a function of resistance if you are keen to log these parameters, and therefore use them to review your track/road sessions. The gauges can be found
here.
Cheers,
Dave