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Old Aug 15, 2006 | 09:36 AM
  #1  
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Default Need Oil Temp Advice

I want to install an engine oil temp guage and sending unit. What is the best way to go? Is there a guage that will fit where my nonfunctional clock is now? Thanks!
Bernie
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Old Aug 15, 2006 | 09:43 AM
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The later C3 oil temp. guage will go right into the clock pos. - just add the wiring. When I added an oil temp. gauge, I moved the oil pressure sender to top of block & put the oil temp. sender by the oil filter.

Did mine a long time ago.
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Old Aug 15, 2006 | 09:45 AM
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Ganey,
Thanks for the information. I will get to work on this!
Bernie
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Old Aug 15, 2006 | 11:47 AM
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Originally Posted by Ganey
The later C3 oil temp. guage will go right into the clock pos. - just add the wiring. When I added an oil temp. gauge, I moved the oil pressure sender to top of block & put the oil temp. sender by the oil filter.

Did mine a long time ago.
40 bucks on ebay
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Old Aug 15, 2006 | 01:04 PM
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This is the gauge that replaces the clock.

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Old Aug 15, 2006 | 01:15 PM
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Originally Posted by paul67
This is the gauge that replaces the clock.

I feel they are not accurate enough. Oil temp runs about 20 degrees behind water temperature. I have a very good gage that has it's sensor in the side of the oil pan. I can read accurately the temperature within a few degrees and I find it varies alot in stop and go and suddenly hitting the open road. While the motor is running at roughly 190 the oil temp is in the 170 range. With that gage how do you read those numbers?? I have yet to see it climb over 200.
You need an accurate gage in the 150 to 240 maximum range with the majority of the readings in the 170- 190 range.
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Old Aug 15, 2006 | 01:16 PM
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To add to this discussion. I am putting in an oil temp guage as well. My BB does not have the upper port behind the distributor that the SB's do. I am running a mechanical oil pressure guage under the hood and an electrical guage in the car. I plan on "T'ing" both of these over the oil filter which leaves the temp guage out.

I was thinking of replacing the oil pan drain plug which is on the side of my MOROSO pan with a brass adapter that will alow the oil temp sender to screw into the adapter in place of the plug. This would give me the temp of the oil in the pan which I had heard was a better indicator. Ideas, comments, thoughts?
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Old Aug 15, 2006 | 01:23 PM
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I have no idea how accurate that factory gauge is. Just thought that Bernie would like to see what GM used in 1981 when the clock function was moved to the radio when the electronically tuned receiver (ETR) stereos were introduced as an option. If originality is a concern then that is the unit.
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Old Aug 15, 2006 | 01:52 PM
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Originally Posted by BlackRat
To add to this discussion. I am putting in an oil temp guage as well. My BB does not have the upper port behind the distributor that the SB's do. I am running a mechanical oil pressure guage under the hood and an electrical guage in the car. I plan on "T'ing" both of these over the oil filter which leaves the temp guage out.

I was thinking of replacing the oil pan drain plug which is on the side of my MOROSO pan with a brass adapter that will alow the oil temp sender to screw into the adapter in place of the plug. This would give me the temp of the oil in the pan which I had heard was a better indicator. Ideas, comments, thoughts?
That's a good idea. The oil pickup is a slim tube that slides into the brass fitting and then the nut tightens the flare on the tube into place to prevent leaks. You could drill out a stock drain plug, run the proper tap into the center of the plug, install the fitting for oil temp gage and then screw in the sender. To change the oil you just loosen the sending unit, slide it out and let the oil drain.
I welded a seperate bung in the side of the pan.
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Old Aug 15, 2006 | 01:55 PM
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Originally Posted by paul67
I have no idea how accurate that factory gauge is. Just thought that Bernie would like to see what GM used in 1981 when the clock function was moved to the radio when the electronically tuned receiver (ETR) stereos were introduced as an option. If originality is a concern then that is the unit.
the factory gage just makes too big a jump between usefull readings. You major area of temp is the 170 range. On a factory gage the 170 is just a wild guess. You go from 100 to 250 to 320 in short jumps.
I use a good 2 5/8th mechanical Auto meter that goes from 140 to 240 in 2 degree increments and every 10 degrees is easy to read.
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Old Aug 15, 2006 | 02:22 PM
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Using the drain plug does work - I had already sealed the pan when I remembered I needed to account for oil temp.

This part from Summit makes the job very clean -
http://store.summitracing.com/partde...5&autoview=sku

1/8" NPT fits most temp senders, just unhook the wire and take the drain plug out as usual for oil change.

Phil
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Old Aug 15, 2006 | 02:32 PM
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I am thinking that I should be able to get a brass pipe reducer plug like you use in the block to replace the drain plug already there. The reducer should screw into the pan and then the sender into the plug.
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Old Aug 15, 2006 | 07:31 PM
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I was going to weld a bung on the side of the oil pan and install the sending unit there. It is a 7 qt. pan with kickouts on both sides. Should get good readings there.
Bernie
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