Select-O-Speed Lube Pressure Switch Replacement

KCM

Member
Hi all,

Been searching high and low on this site and the internet but not much luck finding somebody who has posted a part number for a direct replacement for the original switch. I know the original Ford part number 313942 is obsolete and fits the 1959 to 1964 Select-O-Speeds. Also know the switch specifications are 1/8 NPT male thread, normally closed, single 1/4 spade terminal (grounds to switch body), and opens/closes at 2 psi. Maximum pressure it needs to handle is 12 psi. Only post I found with a part number suggested a NAPA OP6619, but cannot verify it opens at 2 psi, and Nason SM-2C-2F which I have no idea where you would buy that brand. There are tons of oil pressure switches on the web but very few actually tell you what the set pressure is.

Does anybody out there have a tried and proven switch part number that has a set point at 2 psi, will directly interchange (screw terminal could also be used), and won't break the budget. After all, this is just a simple idiot light. Thanks in advance.
 
When I had the SOS rebuilt in my 1967 5000, the technician found a switch that would work and the light on mine works now. Only one I've ever seen. I went through my parts list and found Nason oil pressure switch SM-2C-20F; cost was 42.00 off eBay in 2018. I don't know if it will work in your earlier SOS.
 
I doubt any switch made today is exact at 2PSI on, but how about this one? $10, 2-8 psi on? Kinda looks like the NAPA one...but they all probably do. It is a 2 terminal which makes you have to add a ground (perhaps soldering from one terminal to the body of the switch), but just maybe....

https://www.oreillyauto.com/detail/c/masterpro-ignition/engine-sensors---emissions/engine-switches/oil-pressure-sensor-switch/320d93409c91/masterpro-ignition-2-terminal-oil-pressure-switch/mpi0/28134
 
According to the NAPA website, the OP6619 switch is rated at a switch point of 2-7 PSI, which is a fair bit of variability. And I think most oil pressure switches designed for engines are going to act in a similar manner.

If you wanted an accurate switch, I would go with the Nason design mentioned below. You can go to their website and basically build the switch to your specs. Link below.
Switch builder
 
Back in 2013 I was needing a switch for my 971 and after some hunting I came up with a Honeywell switch, part #78149 2N/C. It has been working fine since but it was $51 back then and I'm sure it hasn't gone down any since then! Sometime before that I bought a Hobbs brand switch with the same part number for another one of my SOS equipped tractors.
 

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