I prefer the AutoMeter brand.
There are 2 types of oil pressure gauges.
1. Mechanical , which sends oil directly to the gauge in the passenger compartment.
2. The electrical sensor type that which oil is sent to and
electrical sensor, then a signal is sent to the gauge. The sensor should not be mounted to the engine, but to a fire wall to avoid excessive engine vibration.

For oil temp gauge, an adapter mounted under the oil filter is the easiest way to measure the temperature. Oil is sent directly to an electrical sensor that sends a signal to the gauge.

Auto parts stores carry these and can be obtained from several performance shops on Ebay and Amazon.

 

For the oil pressure gauge - Do not use a t-tap at the block. DON'T.

You have 2 options.

1) You can get rid of the stock switch style (you will have a light on your dash, or you can remove it, or jumper the stock wire...) and use an aftermarket sending unit with adapter (as long as it isn't too long/heavy) and just go that direction. (this is the far cheaper option)

2) If you want to retain the stock pressure switch (it is not integrated with the ECU, it doesn't care) then you will need to do the following if you want to ensure nothing breaks off and you lose all of your oil (yes, it can and will happen).

Get a stainless line built that runs from the block to where you want/wish to mount your sensors (as MR2Jedi indicated), adapt the block oil pressure port to the stainless line - then at the other end of the stainless end, put your T-Tap and secure it to something solid that doesn't move.

the 4afe holds the pressure sending unit parallel to the ground - adding a t-tap with even the stock switch and a line is too heavy, and it will break through vibration - which will put your oil pressure open - and you will lose massive oil, quickly.

 

Do you think that this oil filter adapter is secure enough, i.e. no breaking off like you say.

http://prosportgauges.com/oil-filter-adaptor-plate.aspx

I like the idea of the remote pressure sender, and the stainless line. Where could I get a stainless line built?

 

There are combo pressure-sensor + low-pressure-switch units that provide both functions. There are tonnes of OEM applications that use these.

https://www.pelicanparts.com/techar...com/techarticles/Boxster_Tech/26-FUEL-Engine_Sensors/26-FUEL-Engine_Sensors.htm

 

On the older Toyotas the block thread is unusual, it's a British standard thread. There are adapters. Why Toyota did this is a mystery. It's the only unusual thread on the engine.

 

Maybe Toyota got a good deal on 1,000,037 sensors with BSPT???

 

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After my initial research, I'm looking into getting both gauges from this website
http://prosportgauges.com/index.aspx

the gauges I like are the
http://prosportgauges.com/Clear-lens-52mm-Electrical-Oil-Temperature-gauge.aspx
http://prosportgauges.com/Clear-lens-52mm-Electrical-oil-pressure-gauge.aspx

only if I can use the "oil filter adapter plate" that they also sell.

How could I ascertain as to whether or not the adapter plate that they say is for MR2's, Scion Tc's and Celica's would work on my 4afe? It's marked as 3/4 UNF - 16 long shaft.
http://prosportgauges.com/oil-filter-adaptor-plate.aspx

 

Measure the threads on oil filter fitting.

 

Well yeah thats obvious, lol, but mah brane don't work ovious like. :wink:

I guess I'm just confused as to what I'm even measuring for as far as their various sizes of oil filter adapters.

The filter is around 3/4; any idea what the "long shaft" implies with the oil filter adapter?

 

The threads on oil-filter housing is too short on MR2 and Celica. You don't have to worry about getting the longer adapter.

 

So something like this is going to get the pressure sensor away from the block

https://www.pegasusautoracing.com/productdetails.asp?RecID=12667

 

Don't have to worry about that if using sandwich adapter. Only problem if using T adapter.

Although should check clearance to block from pressure sensor. There are solid-state piezo-based pressure-sensors that are quite compact and light nowadays. About same size as temp sensor.

 

I got the ProSport gauges and sandwich adapter in the mail. Nice quality. The filter screws right on. I'm anxious to get them installed.

I still think I'm going to relocate the pressure sensor away from the block. Do I need to use stainless braided hose or can I just use rubber hose?

I ran new hoses with fittings and hose clamps when I installed my transmission cooler, so I'm confident I can do this too for the engine oil.