Pressure Switch

[audiomick]

Harpers:

https://harpermoto.com/search?q=17768750A&options[prefix]=last

[p6x]

35 minutes ago, audiomick said:

I very sure the well-sorted parts suppliers in the USA will have it, or something similar, as well.

The major issue there is, after a quick look, most of the pressure switches have no description of the thread, usually NPT, and the pressure threshold at which the light will be triggered.

Thanks to Stein-Dinse, we know that the pressure switch has a M12x150 thread, even if they list it as 1,5; the SI normalize way to call it is 150, so there is no confusion for those that have the dot as a decimal separation. In any case, it means a diameter of 12 mm, with a thread pitch of 1.5 mm (1,5mm). M12 is a parallel thread, so you are going to need a washer.

@Docc: so here is one drop in replacement: https://www.carbuilder.com/products/oil-pressure-warning-light-switch-m12-x-1-5-5psi?_pos=1&_sid=a72d27301&_ss=r

This oil pressure warning light switch is a crucial safety component for your vehicle. It triggers the dashboard oil light when the pressure drops below 5 psi, providing a timely alert to prevent potential engine damage. Featuring an M12 x 1.5 thread and a 1/4" spade connector, it's designed for easy installation and reliable performance. Ensure the longevity and safety of your engine with this essential switch.

• Triggers Oil Light: Alerts you when oil pressure falls below 5 psi.
• M12 x 1.5 Thread: Ensures compatibility with various vehicles.
• 1/4" Spade Connector: Simplifies installation.
• Maintains Engine Safety: Helps prevent costly engine damage.

 

[audiomick]

12 minutes ago, p6x said:

...when the pressure drops below 5 psi...

According to this unit convertor, that is about the same as the Fiat part I posted further up.

https://www.unitconverters.net/pressure-converter.html

Quote

5 psi = 0.3447378647 bar

The one in my link is allegedly for a large number of Fiat tractors. Must be good for a Guzzi.

Seriously, though, the crucial question is whether that opening pressure is appropriate. I have no idea, but I could imagine that it would work adequately. Changing the connector on the wire is not a huge problem. Still, at the price of the part from Stein-Dinse I would just get that and save myself the buggerising around.

[PhillipLarsen]

https://www.mgcycle.com/index.php?main_page=index&cPath=37_140

17768750 - $11.38 - Oil pressure switch most Guzzis thru 2005 GU17768750 [17768750] : MG Cycle, Moto Guzzi Parts and Accessories available online at MGCycle.com
 

[audiomick]

12 minutes ago, PhillipLarsen said:

17768750 - $11.38 - Oil pressure switch most Guzzis thru 2005 GU17768750 [17768750] : MG Cycle, Moto Guzzi Parts and Accessories available online at MGCycle.com

Following that link, I found this under "related products":

Quote

Superseding GU31768780 and 978854. Oil pressure switch for Nevada Club, Breva 1100, Breva 1200, Griso 1100, Griso 1200 8V 2009 to 2014, Sport 1200, Norge 2006 to 2016, Stelvio 2007 to 2011, 1200 Sport 8V, Bellagio. Thread diameter is 12mm on this item, thread pitch is 1.5.

 

https://www.mgcycle.com/index.php?main_page=product_info&products_id=2387

that looks remarkably similar to the "Fiat tractor" part I linked further up

 

maybe we're onto something here...

PS: I searched for the part numbers at Stein-Dinse and got these

https://www.stein-dinse.com/de/search.html?grp=&searchStr=31768780

https://www.stein-dinse.com/de/search.html?grp=&searchStr=978854

so apparently there are more than one alternatives out there.

Edited 2 hours ago by audiomick

[docc]

My 2000 Sport definitely has the "bullet" connector as shown by @PhillipLarsen, not the "spade connector.

[audiomick]

19 minutes ago, docc said:

My 2000 Sport definitely has the "bullet" connector as shown by @PhillipLarsen, not the "spade connector.

Yes, and of course that would be the best solution. Saves altering the wiring. But if that part is not available or should become not available...

Edited 1 hour ago by audiomick

[docc]

On 2/22/2025 at 11:45 AM, bullionz said:

 

Oil Pressure Switch

Hi, the switch on my V11 Sport gave up, it no longer closes the circuit when stopped. I read somewhere here that an automotive one will fit. Anyone have any idea which vehicle and a part No?

Talking about the connector, I found mine a bit corroded this evening when I inspected the type. I gave it a shot of Caig DeOxit® and slipped "the boot" back on.

A couple things came to mind:

1) If the connection fails, it will act like a bad switch and the oil warning light will not illuminate when the bike is not running, ignition on (before start up and a few seconds after shut down). @bullionz failure could be a connection failure.

2) This connection is rather in the weather and the original connection is bare and unprotected. I added this "boot" from the V11 EV ("California?") side of the range.