Mechanical oil pressure gauge install question??

[ein bora]

I'm going to be installing a mechanical oil pressure gauge on my 1.9 IDI, which of the two oil sensors would be the best place to tap in to? Also should I use a splitter and also keep the original electric sensor too??
Any thoughts appreciated. Thanks.

[jtanguay]

i think the 1.9 has an extra port that you can unscrew and install your sender.  if not then you will have to install a T fitting.

best spot is the filter flange.  the side of the head won't give you the actual oil pressure.

[arb]

i think the 1.9 has an extra port that you can unscrew and install your sender.  if not then you will have to install a T fitting.

best spot is the filter flange.  the side of the head won't give you the actual oil pressure.

Yeah, that's best. If you didn't want a "T", you could pull the filter flange and drill / tap another boss for your line.

[ein bora]

i think the 1.9 has an extra port that you can unscrew and install your sender.  if not then you will have to install a T fitting.

best spot is the filter flange.  the side of the head won't give you the actual oil pressure.

Yes - I was thinking the same. As to the t-fitting, I'm assuming that the thread on the 1.9 will be metric, the fitting that comes with the gauge will be standard - is there a metric fitting that will accommodate the gauges fittings?? Or how would I do this??
Any help - thanks.

[ein bora]

i think the 1.9 has an extra port that you can unscrew and install your sender.  if not then you will have to install a T fitting.

best spot is the filter flange.  the side of the head won't give you the actual oil pressure.

Yeah, that's best. If you didn't want a "T", you could pull the filter flange and drill / tap another boss for your line.

Hummm....that would work re the metric/standard thread issue.
Thanks.

[Vincent Waldon]

Yes - I was thinking the same. As to the t-fitting, I'm assuming that the thread on the 1.9 will be metric, the fitting that comes with the gauge will be standard - is there a metric fitting that will accommodate the gauges fittings?? Or how would I do this??
Any help - thanks.

The stock sensors are M10x1... as luck would have it, very very close to the 27NPT (iirc) that many standard NA aftermarket gauge will likely come with.... the oil pressure kit from NAPA, for instance.

I usually use electric gauges and sensors, but on the odd time when I use a mechanical gauge (first engine startup, etc) I've had no problems with the 27NPT fitting, particularly with a few turns of Teflon tape.  YMMV, of course!

[96jetta]

pull the stock sender out and buy a brass T fittin but tap the bittom to an M*10 thred and tighten that in where the stock sender went. put the after market guage on one side of the T fitting and the stock sender on the other side(just so it doesnt beep at u)

[Rabbit TD]

i think the 1.9 has an extra port that you can unscrew and install your sender.  if not then you will have to install a T fitting.

best spot is the filter flange.  the side of the head won't give you the actual oil pressure.

Yeah, that's best. If you didn't want a "T", you could pull the filter flange and drill / tap another boss for your line.

I've been wondering about the same thing.
I'm going to be putting in an oil pressure gauge when I put the new engine in soon, 1.6 T/D and have been wondering the same thing.  My N/A engines sensor for the light is in the head, the T/D has one in the outlet flange along with the turbo oil line.  I'm gonna keep them both but how much difference in pressure is there between a flange and a head reading.  I'm just thinking that the head is the last place in the system to get oil and you want to make sure there is enough pressure left at that point but I never used an actual gauge in one of these engines and don't know what the actual pressure differential is between the 2 locations or what the should show.

[zukgod1]

i think the 1.9 has an extra port that you can unscrew and install your sender.  if not then you will have to install a T fitting.

best spot is the filter flange.  the side of the head won't give you the actual oil pressure.

Yeah, that's best. If you didn't want a "T", you could pull the filter flange and drill / tap another boss for your line.

I've been wondering about the same thing.
I'm going to be putting in an oil pressure gauge when I put the new engine in soon, 1.6 T/D and have been wondering the same thing.  My N/A engines sensor for the light is in the head, the T/D has one in the outlet flange along with the turbo oil line.  I'm gonna keep them both but how much difference in pressure is there between a flange and a head reading.  I'm just thinking that the head is the last place in the system to get oil and you want to make sure there is enough pressure left at that point but I never used an actual gauge in one of these engines and don't know what the actual pressure differential is between the 2 locations or what the should show.

I'll second this comment.

Why in the world would you want to read your oil pressure BEFORE it goes to anything?

When reading at the head your reading the pressure AFTER it goes through all the other bearings. If you have good pressure here everything before it will be good.
If your reading it ant he filter mount your reading the pressure out of the pump, cool and all but I believe your being mislead by this reading.

[zukgod1]

i think the 1.9 has an extra port that you can unscrew and install your sender.  if not then you will have to install a T fitting.

best spot is the filter flange.  the side of the head won't give you the actual oil pressure.

Explanation please?


I've been wrong before and I'm sure I will be again but I think your off base here. If I'm off I would like to know about it so I'll stop giving out bad info.

[arb]

i think the 1.9 has an extra port that you can unscrew and install your sender.  if not then you will have to install a T fitting.

best spot is the filter flange.  the side of the head won't give you the actual oil pressure.

Why in the world would you want to read your oil pressure BEFORE it goes to anything?

When reading at the head your reading the pressure AFTER it goes through all the other bearings. If you have good pressure here everything before it will be good.[/b]
If your reading it ant he filter mount your reading the pressure out of the pump, cool and all but I believe your being mislead by this reading.

To an extent, its all relative, isn't it? What I mean is at the filter will be the highest reading. Lets say 50 psi is normal at that location. If it is lower, you'll be concerned. For the head, it is the lowest pressure in the system. So, lets say 25 psi is normal on your engine there. If it is lower, you'll be concerned. Right ? The absolute pressure is not what you are concerned about, but rather that the bearing are all seeing their normal flow of oil.

That said, I went with the filter boss as the head's absolute pressure is not accurate because it is down stream from many bearings that have oil supply openings on the crank. These open and close many times a second, so the pressure will be fluctuation many times a second. If you had a transducer connection to a scope, you'd see it.

Secondly, what are the failure modes ? No oil, blocked filter, open bypass valve, blocked passages, blown bearing, broken passage, blown gasket. For each and every one of these you'll see abnormal readings ( high or low) at either sample location. Right ?

[zukgod1]

I agree sorta still have a concern.

Yes if said engine is running 25psi at the head and anything different may indicate a problem but if you are it reading at the filter mount I don't think you would see a bad cam tower for instance

Now if your reading at the head you will as well as seeing a main bearing, IM shaft bearing, rod bearing issues.


So far I'm not convinced the filter is the place to read it. I'm sticking with the head untill someone convinces me otherwise.

[arb]

I agree sorta still have a concern.

Yes if said engine is running 25psi at the head and anything different may indicate a problem but if you are it reading at the filter mount I don't think you would see a bad cam tower for instance

Now if your reading at the head you will as well as seeing a main bearing, IM shaft bearing, rod bearing issues.


So far I'm not convinced the filter is the place to read it. I'm sticking with the head untill someone convinces me otherwise.

I think you would see it at the filter (Post filter - as in the pressure the very first bearing sees.)  Here's why - Blown cam tower = more flow = drop in pressure seen at the filter exit. Blocked Cam Tower passage = increased reading at the filter exit.

The VW engineers must have had a similar thought as they put their gauge sensor at the filter exit and the warning light sensor at the head.

[jtanguay]

i think the 1.9 has an extra port that you can unscrew and install your sender.  if not then you will have to install a T fitting.

best spot is the filter flange.  the side of the head won't give you the actual oil pressure.

Explanation please?


I've been wrong before and I'm sure I will be again but I think your off base here. If I'm off I would like to know about it so I'll stop giving out bad info.

explanation of what?

[zukgod1]

best spot is the filter flange.  the side of the head won't give you the actual oil pressure.

There ya go.

I'm looking for an explanation on this comment.