Hello guys I have an eg with a b20bvtec swap (block is fully stock , head has some minor touches) , I am trying to install an oil pressure gauge.
With the gauge another sensor came sizing wise should be correct 1/8" meassure 0-10Bar with a resistance of 3-160Ω , One of the problems that I have is I am not sure which sensor I currently have if its from a b20b or b16a2 (not sure if those 2 are the same).
And my questions are the following:
1) Where is the stock sensor located (by the filter as the b16a2 block)
2) Does anyone have the specifications for the stock sensor min-max bar reading , resistance and generally all the information that is available
3) Has someone before used the stock sensor with an aftermarket gauge?

I know that I am going to have to make a small circuit in order to have it still connected to the ecu and the gauge in order for both of them to function properly.
I do have a sandwitch plate for the conversion and should have the holes neccesary to install the sensor , just a thought I was having since the pin is located on the ecu.
Don't really want to add any more weight to the engine and the sensor is kinda bulky, shoudn't have any problems just an idea.

 

1) you're got it right, it's straight to the left of the oil filter if you're looking at the back of the engine - not to be confused with the knock sensor that's higher up near the manifold in between the middle runners.
2) The stock 'sensor' is just a switch. As such, it doesn't have a resistance value, per se. They are all basically the same for this general generation of engines. The switch is normally closed (connected to ground => warning light ON) and opens up at ~9psi/70kPa.
3) (2) should have answered the question - you cannot use the stock switch with a pressure gauge.

Also, whatever sensor you receive with your gauge is most likely 1/8" NPT. The stock switch is 1/8" BSPT. You can physically thread the NPT sensor into the stock hole, but you will ruin the threads and it WILL eventually leak (or worse, crack the boss). Don't do this - use an adapter. Stainless ones are like $4 on eBay.

Speaking from experience and regret, better to use a sandwich adapter to mount your new sensor and leave the original pressure switch in place. That way you have a gauge but retain your warning light.

How many terminals in the connector of the sensor that came with your new gauge?

 

Already have the oil sandwitch plate , so thank you for your information will mount it there.
The sensor itself has 2 wires that I need to fix , WK based on the diagram thats the ground and G thats the signal wire. From videos and from what I've seen is the classic oil sensor that comes with most gauges.
Sadly don't have any pictures to upload at the moment , but its the same one as boostedboiz used when installing one on the h-build they have.

 

Ahh, one of these kind?

 

Its this one , but should be pretty similar

 

That sensor is quite heavy... do NOT screw it to anything on the block... including a sandwich plate. I suggest you continue to use a soft line (3AN or 4AN) from your proposed block fitting and then mount the sensor on the firewall somewhere... and the line connects in between.

 

X2. That’s a big daddy.

 

That was my thought for the weight aswell , was looking into sto AEM ones which are quite smaller , but that firewall idea is not too bad.
Will search if I can find any similar spec'd sensors but smaller and lighter.

Will update soon

 

I use a MoTeC style sensor, which is MUCH smaller... and I still mount it to the firewall with a flexible braided line connecting it to the block.

 

He’s got some off the shelf analog gauge that needs a two wire sensor. All of the 5V ref sensors are out of the question for his setup unless he wants to turn it into a wiring project.

fwiw, Bosch sensors like these are tiny, affordable, and will live just fine direct mounted on an engine:

 

That actually looks pretty nice , do you have any part numbers that I could check out?

Thank you in advance

 

It’s a Bosch PST-F 1. It’s ~$200 as a Motorsport part, but can also be found on some late model Mazdas (CX7/9) for ~$60, and does pressure and temp in one sensor. But it’s a 5V reference sensor, so I don’t think it will work with your gauge.

 

I was going to suggest the cheap Amazon one again but that didn't even cross my mind (no physical gauge in my application, overlooked). Good point.

I did see thru some Google searches some pressure senders are also pressure switches. Where one terminal is for the sender one is for the switch. Guess gotta read documentation.