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Author
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Topic: Best sending unit locations?
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Toronado3800
Gearhead Posts: 356
From: St. Louis, MO
Registered: Jul 2001
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posted 07-22-2003 07:03 PM
  
Another topic made me think of this. Where are the best places to get your oil pressure/coolant temp readings from? It seems when I had a Temp guage in the T-stat housing I could watch the temp bounce as my T-stat opened and closed. My oil pressure sender was way high in back and always gave momentarily low readings when I shifted.
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69 Sportsroof
Gearhead Posts: 1202
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 07-23-2003 12:02 AM
My water temp sending unit is in the intake manifold right behind the t-stat housing. The oil sending unit is next to the oil filter on small blocks on the side of the block.
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Ryan Wilke
Gearhead Posts: 1501
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 07-23-2003 09:07 AM
I don't know if there is a significant difference in picking up the oil pressure reading from the back of the block vs. the front by the oil filter.... However, I can say that a mechanical gage is quicker to react than an electrical gage. Also, if you use a larger diameter line (1/8" line vs. a 1/16" line) to the gage it will be quicker still. A down side to a mechanical gage is that it could get a leak! So to reduce this potential, ideally, plumb any pressure gage with a stainless-steel braided line from the engine to the gage; a temperature gage will use a thermocouple and should be protected from any damage. Lastly, always use an adequate grommet as you pass thru the firewall with either. Ryan  P.S.
NEVER use a mechanical fuel pressure gage inside the car. If you are using one, mount the gage on the cowl, outside the car. You don't want a pressurized gasoline leak inside your car! 
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Toronado3800
Gearhead Posts: 356
From: St. Louis, MO
Registered: Jul 2001
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posted 07-23-2003 07:41 PM
Amen to that about the pressurized leak Ryan! One day I'm going to hook up both a mech and electrical guage onto the same location using some kind of "Y" fitting just to watch the differences.
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