Help with oil Pressure

[78fj40mg]

I've got three calibrated electrical gauges in mine; not so much that I didn't trust the stock ones, but I did want something more functional than stock and I was upgrading my cluster lighting and alternator anyway.

I like the three calibrated electrical gauges, where did you source them?

 

[1911]

1911. How did you attach the Tach to the steering column?

Radiator hose clamp, which is hidden/covered by the plastic steering column cover.

 

[Griffin]

Didn't read the whole thread, so forgive me if this has been covered or if you are taking a different rout.

I recently ran a T for a mechanical oil pressure gauge and used these parts from McMaster-Carr. I may have ordered too much, but it worked.

I have the autometer pro comp ultra light and i replaced the stock sending unit. Works like a charm.


4860K141 British Standard Threaded Brass Pipe Fitting, 1/8 Pipe Size, NPT Female X BSPT Male Adapter

4860K461 British Standard Threaded Brass Pipe Fitting, 1/8 Pipe Size, BSPP Female X BSPT Male X BSPP Female TeeE

 

[1911]

I like the three calibrated electrical gauges, where did you source them?

The gauges are off-the-shelf Autometer units; I can probably find the part numbers if you want, BUT...

they can't be mounted in the stock instrument cluster, you need to make a new back to hold them and a mask in front of the gauges to make them look right. I bought all of the above as a kit from mud member "amaurer", per this old thread: https://forum.ih8mud.com/40-55-seri...ven-mechanical-gauges-into-stock-cluster.html

Unfortunately, he is no longer making and selling the kits though.
Too bad, as it was a well thought out and quality kit. So glad that I bought one while he was still making them! It came with a luminescent wire lighting kit - so nice to actually be able to see and read all gauges at night.

 

[bj40green]

Is there a particular base impedance on the toyota sensor so I can compare it with my after market one

Hi Crumbo,
I checked the sender this morning and is what I suspected.
My tester reads OL (Open Loop) so with the engine off there is no OIL pressure to activate the sender unit.

Rudi

 

[73tlcv8]

oil pressure sender

Is there a particular base impedance on the toyota sensor so I can compare it with my after market one

To have the correct mental picture, the toyota oil sender is not a variable resistance device like the fuel sender. It controls current via a bi-metallic strip regulator similar to the regulator in the fuel gauge. With no oil pressure, the points are open. As oil pressure builds, the points are pushed closer together so more current flows causing the oil gauge to deflect to the right.

 

[Coastline]

The gauges are off-the-shelf Autometer units; I can probably find the part numbers if you want, BUT...

they can't be mounted in the stock instrument cluster, you need to make a new back to hold them and a mask in front of the gauges to make them look right. I bought all of the above as a kit from mud member "amaurer", per this old thread: https://forum.ih8mud.com/40-55-seri...ven-mechanical-gauges-into-stock-cluster.html

Unfortunately, he is no longer making and selling the kits though.
Too bad, as it was a well thought out and quality kit. So glad that I bought one while he was still making them! It came with a luminescent wire lighting kit - so nice to actually be able to see and read all gauges at night.

Bummer. I am pretty happy with my set-up from Drew.

 

[hatman406080]

Crumbo. Having a switch istalled would make sense. My gauge would only show High or Low.

Green, Thanks for some good explaining. On my last helicopter world we had a gauge of pressure and then a secondary low pressure switch. They would often contradict each other. Similiar to what I have installed. The CCOT Oil pressure sender is only $22. Is this a good replacement or should I spend the $70 for a Toyota Part? The CCOT sender also has a ground wire connector but I am not sure what for or where to connect it?

1911. Nice gauges. When I rebuilt my gauges I considered doing that. I instead went for mechanical gauges in the factory radio slot. I have a mechanical water, voltmeter, and soon to be hooked up mechanical oil pressure.

call "beno" at proffitt's cruiser 801463313office 5058054730 cell, for OEM And use pats

OEM list $72.24 mud $57.79

 

[hatman406080]

got one "amurer" kit for sale in classifieds ad

 

[crumbo]

Hi Crumbo,
I checked the sender this morning and is what I suspected.
My tester reads OL (Open Loop) so with the engine off there is no OIL pressure to activate the sender unit.

Rudi

Thanks Rudi.
My factory meter has always read in the low range but the mechanical guage gives me about 57psi after running the engine for about half an hour. am on my way for a 2000 km trip to do a job for SBS television on the 12th of Dec so that should really test her out...not looking forward to 10 hours in the chair though.
I'll be going through lots of cattle stations and Aboriginal communities on the way so I will be keeping an eye out for bits and pieces!
Jeff

 

[61n72cruisers]

the oil pressure senders are really variable resistors. the sending unit has to be within a specific range of resistance to be compatible with a particular gauge. varying oil pressures send different amounts of current to the gauge which causes the bi-metal strip inside to heat, or deform a different amount depending on the amount of current which then deflects the needle. i'll watch this post and if bj40 can't find his notes, and you still would like to know, then i'll search for mine as i have the resistances for some of the units.

 

[bj40green]

To have the correct mental picture, the toyota oil sender is not a variable resistance device like the fuel sender. It controls current via a bi-metallic strip regulator similar to the regulator in the fuel gauge. With no oil pressure, the points are open. As oil pressure builds, the points are pushed closer together so more current flows causing the oil gauge to deflect to the right.

the oil pressure senders are really variable resistors. the sending unit has to be within a specific range of resistance to be compatible with a particular gauge. varying oil pressures send different amounts of current to the gauge which causes the bi-metal strip inside to heat, or deform a different amount depending on the amount of current which then deflects the needle. i'll watch this post and if bj40 can't find his notes, and you still would like to know, then i'll search for mine as i have the resistances for some of the units.

You are both close but not 100%
The Toyota pressure sender is Voltage Regulator built on a bi-metal system that opens and closes at a certain ratio. When the open time is longer than the close time the gauge indicates LOW. When the open and close time are equal the gauge shows in the middle and when the close time is longer than the open time, the gauge shows HIGH.
The open/close ratio is determent by the oil pressure. The pressure "moves" the working point of the VR up and down.

Rudi