OIl Pressure Sender/Gauge

[dude8383]

I've got a strange problem with my oil pressure gauge. On startup the needle is pegged to the far right past 150psi...when I accelerate the needle starts to level off around 70-90psi. The more throttle input the lower the reading.

I know 100% that this is wrong so I'm thinking that it has something to do with the ohm's..

Here's the sender I purchased:

R8919 Pressure Sender: 0-150 PSI - 1/8 NPT - 240-33 Ohms

The gauge I have no idea but its either a 240-33 ohms or 10-180 Ohms but it must the latter since the gauge isn't reading right...

My question is, do I need another sender/gauge all together, or can I just somehow use resistors to trick it into thinking that its getting a proper reading from the sender?

[dude8383]

Any advice? Has this ever happened to anyone before?

[nando]

what gauge/sender is it? the VDO one I have has 2 posts, one for the dummy light, and one for the actual pressure reading. If you hook the gauge up to the wrong post it will behave something like that.

[dude8383]

what gauge/sender is it? the VDO one I have has 2 posts, one for the dummy light, and one for the actual pressure reading. If you hook the gauge up to the wrong post it will behave something like that.

Whoops I forgot to include that in the original post.

It's a VDO Vision 350-108, no dummy light, just a +/- for light and +/- for power plus the wire coming from the sender itself.

The gauge is rated for 10-180 Ohms.

http://egauges.com/vdo_mult.asp?Type=Elec_Engine_Pressure&Series=Vision&Units=E

Posting that question just made me realize that I ordered the wrong sender...

R89810 should have been the one...

http://egauges.com/vdo_send.asp?Sender=150PSI_10Bar

Doh!!! Is there any way to get them to talk to each other? Or would it be easier to just order the right one?

[nando]

no, it looks like the sender you have has a resistance curve with the wrong slope. you'll have to order the other one.

[dude8383]

no, it looks like the sender you have has a resistance curve with the wrong slope. you'll have to order the other one.

Thanks man. Going to order the right one then!