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Question oil pressure gauge indications jumping...sender?

I've done a quick thread search and haven't found my answer yet. My oil pressure gauge alternately pegs out high, bounces to nothing and then kind of back an forth...just started this yesterday. I'm guessing I probably need a new sender. Anyone have any other suggestions I can check out when I get time this weekend for me and the p-car??
Thanks, fellas
Ryan

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To the memory of Warren Hall (Early S Man), 1950 - 2008
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1990 964 C4 Cabriolet (current)
1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold)
Old 03-13-2003, 04:01 PM
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Try cleaning and tightening the spade terminal at the sending unit first.
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Robert Stoll
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Old 03-13-2003, 04:02 PM
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Robert,
That's what I'm talking about! Thanks for the tip...I was thinking there would be an electrical issue to checkout first. I don't have my manuals with pics handy this second and it's dark outside now. I'd like to take a quick look before I drive home...is the sender on top of the engine near the rear?
Ryan
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To the memory of Warren Hall (Early S Man), 1950 - 2008
www.friendsofwarren.com
1990 964 C4 Cabriolet (current)
1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold)
Old 03-13-2003, 04:06 PM
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On my 83 it is on pass side just below the a/c compressor.
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Robert Stoll
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Old 03-13-2003, 04:09 PM
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Robert,
Thanks for the quick comeback. As we'd say in Arkansas...you are a 'good 'ol boy'!
Ryan
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To the memory of Warren Hall (Early S Man), 1950 - 2008
www.friendsofwarren.com
1990 964 C4 Cabriolet (current)
1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold)
Old 03-13-2003, 04:11 PM
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check the sender and gauge with a 20 dollar mechanical gage. i would park it until i knew for sure. on the 72 the sender is above the flywheel at the parting line for the case.
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Old 03-13-2003, 04:25 PM
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Here's a quick shot.
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Old 03-13-2003, 04:26 PM
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you should also check the grounds at the instrument cluster....
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Old 03-13-2003, 04:36 PM
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Robert your pic must be of a later model. To find the sender on a '72, you need to remove the air cleaner housing, look dead center of the engine top, towards the front of the car. How do I know? Yeah, I had to change a sender last year...can you imagine one giving out after 30 years? Horrible quality these days!
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"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent."
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Old 03-13-2003, 04:58 PM
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Yeah Paul, mine is a backdated 83
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Old 03-13-2003, 05:00 PM
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Hi Robert,
Checked outside with a flashlight. Mine's right where yours is located. Connections look ok, but could use a good going over with the wire brush this weekend. Tim, I was thinking of looking behind the cluster as well...
Ryan
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To the memory of Warren Hall (Early S Man), 1950 - 2008
www.friendsofwarren.com
1990 964 C4 Cabriolet (current)
1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold)
Old 03-13-2003, 06:14 PM
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Anybody else ever experience this symptom and resolved it by cleaning up the various associated electrical contacts, avoiding a sender replacement?
Ryan
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To the memory of Warren Hall (Early S Man), 1950 - 2008
www.friendsofwarren.com
1990 964 C4 Cabriolet (current)
1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold)
Old 03-14-2003, 05:28 AM
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update:

I checked my wires behind the gauge itself in the cluster...everything looks beautiful.

I've cleaned all contacts in the rear on the sender with a wire brush. They're beautiful now too, both power and ground.

The gauge seems smooth and maybe working until pressure reaches around 40-50 psi (2500-3000 rpms when cold, ballpark) and then it just jumps up and pegs 140. When I get back down to idle it seems to settle around 20-30 psi like I'd expect. Any ideas? Should I just bite the bullet and get the new sender? Anything else I should try?

Ryan
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To the memory of Warren Hall (Early S Man), 1950 - 2008
www.friendsofwarren.com
1990 964 C4 Cabriolet (current)
1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold)
Old 03-17-2003, 01:25 PM
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I vote new sender...

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"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent."
-Ferry Porsche (PANO, Oct. '73) (I, Paul D. have loved this quote since 1973. It will remain as long as I post here.)
Old 03-17-2003, 01:51 PM
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