Hello Friends!

Hopefully the picture of the oil pressure sending units attached (one goes to a S/W gauge, the other to an alarm), Ford 427 motors.

Two questions:

1.  Do you have a good source for both sending units?

2.  If I expand the pictured "manifold" that the sending units assemle to, can I add a third position for a direct analog guage?  If yes, any recommendations on supplier, type, etc.?   I'd like to add a guage to sit right on this manifold so I can read pressure while enjoying my days in the bilge.

(The open receptacle shown in the picture is where the oil line connects.)

Thanks in advance.

Chris BenedictOil%20Pressure%20Sending%20Units.jpg

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Oil Pressure Sending Unit

It might be easier to see the photo link here.


First, the large sending unit merely lets an alarm go to ground under low or no oil pressure conditions, so adding a second alarm to this switch is no problem. The smaller one is for an oil pressure gauge, and your question has been answered many times in SuperDisc. I'm copying Willie Leipert's answer for you.


#41796 From: William Leipert <wmleipert@...> 
Date: Wed Jul 13, 2011 6:27 pm 
Subject: Re: [CCCC] Oil pressure sending unit

Jesse, I replaced one oil pressure sending unit on my 1969, 31ft Commander several years ago. I got mine from NAPA; oil pressure sending unit; ECHLIN OP6748. under the bar code on the box: 7-07390 931197. On nut above screw threads: 8J; D7. This replaced Stewart-Warner 201359 on top left of paper tag. "G" engraved on bottom above electrical stud. Top of male threaded connection: 411L; 12-V; 9907; 60. The information phone number in my notes is 1-800-487-1837. Part # 279D for a 60 PSI; former part # 411L. That ought to cover it, regards, Willie Leipert.


OK, as to the analog gauge -- Go to any auto parts store and buy one. They're pretty cheap. See picture below on how I did it on our previous 38 ----- I merely used a brass tee and a close nipple to get the extra port.

Be careful trying to buy a sender at the auto store!!  The std sender is 0 to 80 psi, the senders used on the 427's were 0 to 120 psi.. Check your gauges. The black sender is for the gauge and the little silver one is the alarm.

PS if you want engine room gauges go with mechanical.

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