M11 Oil pressure sending unit

depends on truck.. Usually M11 oil pressure is read with one sender unit and ECM gets engine data with J1708 ore J1939 (Celect+).

 

Truck maker can install additional sensors. like early volvos had addtional oil pressure sensor and addtional coolan temp sender connected directly to dashboard. but from '98 instruments uses data from J1708. on some late models from J1939.

'98 is too old truck for Ukraine, we have later 2001 models. and no additional sensors, all data with CAN

 

In a 98 Aussie KW the dash is not communicating with the engine ECM, but I have been wrong before.
One of the two sensors on the filter housing is probably for the gauge, and the other is a switch for the low oil pressure light.
Are your gauges VDO?
What is the problem with the gauge, flickering or inaccurate?

 

try to compare with ECM sender unit reading. use Insite, actual valueil presure

 

Suggest that you take it to an auto sparky who can check the oil pressure with a test pressure gauge.
If the truck gauge is inaccurate he can then check its calibration with a resistor box. Sorry, I can't remember the calibration resistances. If the gauge is accurate it must be the sensor.
Also pay to check the engine, chassis, cab, and dash earthing as well.
New VDO gauges are now plain black and white rather than having the green and red markings that your original ones probably have. KW may have original gauges, at a price. The decal on the lens can be removed to fit the new gauge.
The sender is a standard VDO 5Bar sender.