Topic: 1967 Oil Pressure switch wiring and harness-small block

[Z67Fback]

I need to replace the wiring to the Oil pressure switch on my Metuchen built 1967 Mustang Fastback with 289, power steering. no tachometer,no ac.

What is the correct 'connection 'to the oil pressure switch, I see most of the parts house have a harness with 'push on connectors" Is that correct. Currently my lead has a circular terminal that is fastened underneath a nut on the switch terminal. Any pictures on correct connection, correct harness and routing would be awesome. Thank you

[J_Speegle]

Tachometer or without?

[Bob Gaines]

I need to replace the wiring to the Oil pressure switch on my Metuchen built 1967 Mustang Fastback with 289, power steering  and no ac.

What is the correct 'connection 'to the oil pressure switch, I see most of the parts house have a harness with 'push on connectors" Is that correct. Currently my lead has a circular terminal that is fastened underneath a nut on the switch terminal. Any pictures on correct connection, correct harness and routing would be awesome. Thank you

if it has a oil pressure gauge and not a idiot light then the 67 oil pressure sender typically has a terminal (for lack of a better description at the moment)shaped like a mushroom . It has a round disk on top that the factory wiring harness connector slides over the small disc top. I think 67 is the only year this type was used . The other years senders had a straight threaded stud terminal . It sounds like someone made a adapter so that another sender would work on your 67.I don't have my picture files handy but here is a ebay auction with one the demonstrate the terminal .  https://www.ebay.com/itm/1967-1968-1969-FORD-MUSTANG-MERCURY-COUGAR-OIL-PRESSURE-SENDER-NEW-2469/371005867119   .  Disregard the description because this type will only fit a 67 harness because of the mushroom terminal.I have a NOS Ford sender that I could sell if interested.

[Z67Fback]

No tachometer

[Bob Gaines]

No tachometer

The difference is if it has a gauge vs. a idiot light . The idiot light sender is a small button switch which turns a light on and off . The pressure gauge sender is barrel shaped with a slight cone top like the ebay link picture. The gauge shows variations in pressure 0-60 etc.   

[J_Speegle]

No tachometer

Good then your car would have had a sender with a threaded post rather than one that accepts a slide attachment on the end of the wire.

Pictures I have of cars show a 45 degree push on boot in that application

A related TSB from 67 explaing the change and identification of the different sending units at that point



TSB was originally posted here in another thread but it solely focused on cars with the tachometer in 67

[Bob Gaines]

Good then your car would have had a sender with a threaded post rather than one that accepts a slide attachment on the end of the wire.

Pictures I have of cars show a 45 degree push on boot in that application

A related TSB from 67 explaing the change and identification of the different sending units at that point



TSB was originally posted here in another thread but it solely focused on cars with the tachometer in 67

I am not sure if the TSB has a wrong illustration or if a change over occurred or what? I have seen a number of the slide one connector wiring harness's on V8 Mustangs that used a sender that looked like this . It is my understanding that disc top of the terminal is a 67 only feature.  I know you can choose to change your engine gauge feed harness or buy a adapter from NPD to run the typical threaded post send instead of the disc type. 

[J_Speegle]

Agree that the drawings may be misleading (generic drawings borrowed from something else - like the shop manuals do at times) since the focus of the TSB is not on the attachment but on the shape and size of the sending unit.

Have seen allot of 67 with the slide on (guess that's the best description for the moment) also. Will look through my pictures to see what they can add to the discussion. Don't recall anything published on the change of the attachment point from Ford. Which is a little surprising. Wonder if we will find that it was another running change. Something else to check

[J_Speegle]

Without going into all the other details I found going through my picture collection - we'll save that for another thread.

Here are four examples from around your cars plant and time period. Please ignore the other PO changes and choices Does appear to support the slide on connection from the engine feed wire loom

Clock wise from top left  - 7T19xxxx-7T20xxxx-7T232xxx-7T237xxx

[Z67Fback]

Jeff, Bob.
Thank you so much for your detailed responses Yikes, no wonder I was confused on what was correct.

[dave6768]

Maybe I'm missing something, but Jeff's bottom two pics do show the slide-on connector.

[jwc66k]

Maybe I'm missing something, but Jeff's bottom two pics do show the slide-on connector.

Yup.
Jim

[Bob Gaines]

Maybe I'm missing something, but Jeff's bottom two pics do show the slide-on connector.

That is because Jeff said in regards to the pictures 

Does appear to support the slide on connection from the engine feed wire loom

The slide on style was typical for 67 production.