Oil Pressure Sensor

Gotta love that wiring . . .
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jandarah
Posts: 113
Joined: Thu Apr 30, 2015 1:52 am
Your car is a: 1977 124 Spider
Location: Mount Hallen, Queensland, Australia

Oil Pressure Sensor

Post by jandarah »

Hi, I am in the process of installing a Veglia oil pressure gauge as an additional gauge into my 77 Spider. Not having the sensor, I purchased one from Hong Kong on eBay. It is a two terminal one, one lead for the pressure, one for the low pressure light. When I checked the gauge on the bench, maximum resistance gave the lowest pressure reading and the lowest resistance gave the highest pressure reading. It is well made and the price was acceptable.

However, the pressure sensor works the opposite way, max resistance, max pressure and minimum resistance, lowest pressure and low pressure light on. In the car, when the ignition is switched on, the gauge goes full scale and the light comes on. Once the engine is running, the gauge shows around mid reading and the low pressure light goes out. When the car is revved, the gauge needle moves to the left, all back-to-front. :?:

Is this normal for the Veglia gauges and matching sensors or do I have the wiring incorrect? I cannot see the wiring being wrong, otherwise a short would occur. If this is the case then I need to purchase a sensor specific to the Veglia. :?

Thanks, in anticipation,
John in Oz
First Fiat: 1970 124 sedan 1970 - 1976
Then horse float towing vehicles up to present.
Current Fiat: 1977 124 Spider 1756cc with twin Weber 40 IDF's
1970 124BC coupe; 1756cc with twin Weber 40 IDF's, used for sprinting
djape1977
Posts: 985
Joined: Sat Apr 21, 2012 6:08 pm
Your car is a: 1970 fiat 124bc
Location: Belgrade, Serbia, eastern Europe

Re: Oil Pressure Sensor

Post by djape1977 »

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Nanonevol
Patron 2018
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Posts: 828
Joined: Thu Nov 13, 2014 9:17 am
Your car is a: 1977 Fiat 124 Spider
Location: Medway, Massachusetts

Re: Oil Pressure Sensor

Post by Nanonevol »

My '77 has one as original equipment I'm sure.
1977 Fiat Spider
1985 Jaguar XJ6
1967 Triumph Bonneville (hard-tail chopper)
1966 BSA Lightning
jandarah
Posts: 113
Joined: Thu Apr 30, 2015 1:52 am
Your car is a: 1977 124 Spider
Location: Mount Hallen, Queensland, Australia

Re: Oil Pressure Sensor

Post by jandarah »

Thanks for the information and the websites. I will certainly check them out. Some prices are very high for such a simple item. The Lada ones may be the ones to look at.

My Spider came into Australia in 1988 and would have been converted to right hand drive here. Who knows what parts are original??
John in Oz
First Fiat: 1970 124 sedan 1970 - 1976
Then horse float towing vehicles up to present.
Current Fiat: 1977 124 Spider 1756cc with twin Weber 40 IDF's
1970 124BC coupe; 1756cc with twin Weber 40 IDF's, used for sprinting
vandor
Posts: 3996
Joined: Sat May 23, 2009 1:23 pm
Your car is a: 1971 124 Spider
Location: Texas, USA

Re: Oil Pressure Sensor

Post by vandor »

Nanonevol wrote:My '77 has one as original equipment I'm sure.
They deleted the oil pressure gauge (and made a bunch of other changes) in the middle of the 1977 model year.
Csaba
'71 124 Spider, much modified
'17 124 Abarth, silver
http://italiancarclub.com/csaba/
Co-owner of the best dang Fiat parts place in town
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