Gauges and Sending Units Caterpillar/ M1078

[Lugnuts]

Sticker Shock once again brings me to the Steel Soldiers Advisory Committee/ I haven't researched it and this is my first place to come so maybe my powers of observation can be scrutinized/
Dealing with my Oil Pressure the first place I dealt with was the gauge and is it working/ After removing and cleaning the ever so common green going mess from the gauge and connectors I established that the gauge was good/ My real question comes in this - does it take a proprietary sending unit or can I use a Cat sending unit stock/ As a matter of fact what is the voltage on the gauges ie 12 or 24/ and are their any common places that the wiring fails between the gauge and sending unit/ And are there any other suggestions or comments that any one has to add regarding their experience with the gauges/
Thank you!!!

 

[Ronmar]

The gauges are 24V for their operational/sensing circuits, but use 12V lighting… in the case of the oil pressure, I am assuming this is on an A0 truck, it is a stewart warner sensor. 506AZ…

Again, assuming this is an A0, there is one main engine harness connector down along the drivers frame rail…

 

[Lugnuts]

The gauges are 24V for their operational/sensing circuits, but use 12V lighting… in the case of the oil pressure, I am assuming this is on an A0 truck, it is a stewart warner sensor. 506AZ…

Again, assuming this is an A0, there is one main engine harness connector down along the drivers frame rail…

Thank you Ronmar. Yes it is an A0. Thank you for the number also!!!

 

[coachgeo]

...A0 truck, it is a stewart warner sensor. 506AZ… (@24v)...

is this the same sensor that is used to excite the alternator?

 

[Lugnuts]

is this the same sensor that is used to excite the alternator?

Without looking at a wiring schematic does that mean if the alternator excites that the sensor is good or is there 2 parts to the sender. A ground and a potentiometer for the gauge? Is that sensor also located in the middle of the engine block on the left side?

 

[Ronmar]

No its not the same sensor. This the gauge sensor. The other sensor is the 15 PSI low oil pressure switch that drives the low oil light in the dash, and relay K11 that controls alternator excitation after the oil pressure opens that switch when running…