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1970 Factory Oil Pressure Gauge What does each line mean?
#2865416
12/27/20 07:55 PM
12/27/20 07:55 PM
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Joined: Apr 2012
Posts: 364 US
f2502011
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1970 T/A with factory rally gauges. Oil pressure gauge goes from L to H with marks or lines in between. How much PSI is each line and what line(s) are normal cold and at full operating temp?
1970 EK2 T/A 727
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Re: 1970 Factory Oil Pressure Gauge What does each line mean?
[Re: f2502011]
#2865437
12/27/20 08:49 PM
12/27/20 08:49 PM
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Joined: Jan 2003
Posts: 20,892 A collage of whims
topside
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A collage of whims
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Normally there's not an exact spec, merely that a mid-range reading is OK. Production variances (engine, wiring, the gauge itself), oil viscosity, RPM, and temperature also affect it. If you want to assign a # to each hash mark, you'll need a mech gauge for comparison.
Years ago, 911 gauges had readout #s, and some owners would annoy the Service guys if their gauge differed from what they thought they should be reading. Porsche removed the #s, and the official line was "if it's in the OK range, it's OK, now run along".
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Re: 1970 Factory Oil Pressure Gauge What does each line mean?
[Re: topside]
#2865486
12/27/20 10:20 PM
12/27/20 10:20 PM
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Joined: Apr 2012
Posts: 364 US
f2502011
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Looking more for what PSI each increment indicates. From memory mine usually ran in the middle or just slightly under the middle of L and H, but today it ran one mark under or 2 up from L. Just wanting to make sure all is ok.
1970 EK2 T/A 727
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Re: 1970 Factory Oil Pressure Gauge What does each line mean?
[Re: f2502011]
#2865490
12/27/20 10:26 PM
12/27/20 10:26 PM
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Joined: Jan 2003
Posts: 10,752 North Dakota
6PakBee
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IIRC the oil pressure sender is an 80 psig sender. So with four divisions I would think that each division is about 20 psig.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: 1970 Factory Oil Pressure Gauge What does each line mean?
[Re: 6PakBee]
#2865501
12/27/20 10:47 PM
12/27/20 10:47 PM
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Joined: Apr 2012
Posts: 364 US
f2502011
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OP
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IIRC the oil pressure sender is an 80 psig sender. So with four divisions I would think that each division is about 20 psig. So I'm around 40 PSI in the 2000-3000 RPM range. Is that ok?
1970 EK2 T/A 727
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Re: 1970 Factory Oil Pressure Gauge What does each line mean?
[Re: dvw]
#2865609
12/28/20 10:25 AM
12/28/20 10:25 AM
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Joined: Jan 2003
Posts: 10,752 North Dakota
6PakBee
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No way the factory gauge is linear. If you want a true reading connect a good gauge. Same with the temp and tach. I have a E body with the ralley cluster. The tach is of 5-10%. The temp and oil pressure always read on the 1st mark. I know the engine has over 50 psi. Doug Depends what you are talking about. If you look at the gauge itself, the spacing between divisions is not equal. The gauge scale linearizes the reading.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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