dual oil pressure gauges?


Information and questions on GL1100 Goldwings (1980-1983)
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kotkinjs1
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Joined: Thu Jul 01, 2021 8:26 pm
Location: Wesley Chapel, FL
Motorcycle: 1982 GL1100

dual oil pressure gauges?

Post by kotkinjs1 »



Hi again,

So in trying to restore some of the stock-ness back to this naked '82 GL1100, I found an original instrument/light cluster unit and hooked it up and wired it in. It all works except the oil light and maybe the engine temp dial (not sure yet because I haven't had it out yet but when I turn the bike on the needle doesn't move at all). But anyway back to the oil light - it doesn't work because the PO installed a little Accel oil pressure gauge out of the engine where the little screw in sending unit used to be. I've seen in another post here after research that someone engineered a way to have both, the little gauge and a working connection to the dummy light via a t-connector coming out of the engine which the sending unit screws into. So the sending unit screws into one end of the T and the physical pressure gauge into the other.

I'd like to have both if possible too but I can't find any more info on what type of connection to look for. I like the dummy light because it's an immediate visible warning vs having to randomly look all the way down to see what the running pressure is....but it's also nice I guess to know what the actual pressure is so you can see problems starting before they become a real problem.

So has anyone seen a double output t-connector type of setup like this and can provide some parts details? Thanks!








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Rambozo
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Re: dual oil pressure gauges?

Post by Rambozo »

Oil psi fittings are typically 1/8" NPT. The real trick is having the room for everything. You may need a nipple and a tee. It depends on the size of the sensors.
Based on your photo, maybe a run tee will do the job. I can't see all the fittings that connect the gauge, but it looks like a long nipple comes out sideways.
https://www.amazon.com/Steel-Inch-NPT-R ... B076VP2RHM
kotkinjs1
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Joined: Thu Jul 01, 2021 8:26 pm
Location: Wesley Chapel, FL
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Re: dual oil pressure gauges?

Post by kotkinjs1 »

Thanks! So with that connector I can buy and install the oil pressure sending unit into one female end of that T and then reconnect the gauge to the other female end? Bare with me.....I learned what I know about wiring so far by working on this Goldwing and I know even less about pipe fittings. I had to google NPT and run tee. ;)
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AZgl1800
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Re: dual oil pressure gauges?

Post by AZgl1800 »

yes you can.

oil pressure is the same all through the system.
you could install 20 oil pressure gauges if you had enough Tees, all of them would read the same, if the calibration is the same.

I still have an old mechanical oil pressure gauge from the '50s, great looking gauge, but very cumbersome to use on a motorcycle. I just remembered, it was made by "Moon auto accessories"



~John

'02 GL1800
2009 Piaggio MP3 250cc
kotkinjs1
Posts: 9
Joined: Thu Jul 01, 2021 8:26 pm
Location: Wesley Chapel, FL
Motorcycle: 1982 GL1100

Re: dual oil pressure gauges?

Post by kotkinjs1 »

ok, thanks again all. I think I've got the set-up in my mind. Now just to get some parts:

- the t-connector with 2x 1/8" female and 1x 1/8" male NPT fittings
- an oil pressure sending unit for one of the female ends of the t connector
- already have the gauge and piping for the other female end
- sub-harness part 32104-MB9-010 for an 82 GL1100 (or 32104-MB9-780 for an 83; I think they're the same part, just different numbers - if someone knows otherwise, please correct me)

My bike already has most of the sub-harness hooking up what I think are the thermostat switch, the engine/coolant temp sending unit, the neutral switch, and the black and red multi-pin connectors but it missing the rubber boots for the sending units and the unused oil pressure sending unit wire was tucked down and in behind the timing belt front case so the blue braided wire is kinda nasty so I figure I'll just replace the entire sub-harness. Should be a pretty easy swap in and out? If there's another mod from the PO I haven't discovered yet affecting the sub harness maybe I'll just cut and splice in the oil sending unit wire with boot.
Last edited by kotkinjs1 on Wed Jul 21, 2021 7:47 pm, edited 1 time in total.
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83 MUTT
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Re: dual oil pressure gauges?

Post by 83 MUTT »

#2 gauge, the first one was 20lb low
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kotkinjs1
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Re: dual oil pressure gauges?

Post by kotkinjs1 »

83 MUTT wrote: Wed Jul 21, 2021 7:39 pm #2 gauge, the first one was 20lb low
I didn't think normal operating pressure was that high? That's reading about 70psi?

And where's that tube go coming out of the top of the t?
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83 MUTT
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Re: dual oil pressure gauges?

Post by 83 MUTT »

to the first one i installed
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Rambozo
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Re: dual oil pressure gauges?

Post by Rambozo »

Reminds me of Paul Klipsch always wearing two watches. ;)

That wiring is long discontinued. Your options are a used one or make your own.
https://www.ebay.com/itm/312695855949
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AZgl1800
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Re: dual oil pressure gauges?

Post by AZgl1800 »

I too, did not think the Honda engines pushed that much Oil Pressure?

I was of the opinion it was in the 20 to 30 psi range?
~John

'02 GL1800
2009 Piaggio MP3 250cc
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Rambozo
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Re: dual oil pressure gauges?

Post by Rambozo »

Last bike I had a gauge on was my CB750. About 20 pounds at idle and 60 pounds at speed. At least until I beat the rod bearings out with too much nitrous. :oops:
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Rambozo
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Re: dual oil pressure gauges?

Post by Rambozo »

AZgl1800 wrote: Wed Jul 21, 2021 12:52 pm yes you can.

oil pressure is the same all through the system.
you could install 20 oil pressure gauges if you had enough Tees, all of them would read the same, if the calibration is the same.

I still have an old mechanical oil pressure gauge from the '50s, great looking gauge, but very cumbersome to use on a motorcycle. I just remembered, it was made by "Moon auto accessories"


Moon oil pressure.png
They are still around. I drive by them all the time.




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