MF150 guage question

[bubbanm]

OK I'm still struggling with my guage issue. Looking at an electrical diagram for my tractor it shows a power supply for the guages. Does
anyone know what it looks like and where it would be? Do the guages need power to work or are they mechanical and do I just need to
replace all the sending units for oil pressure, water temp and fuel if they are mechically powered? I'm not trying to get the backlights
to work I just want the guages to work.

 

[ptfarmer]

Only the fuel, and amp gauge need power. The power supply "transformer" for all the gauges is for the back lighting of the gauges.