On my 1980 4wd pickup I am having issues with the sr5 oil pressure and amperage gauge not workin. Traced the wires down through the harness plug and found two disconnected red wires that seem to split off of the line. This is located by the transmission shifter. (Looks to me like the green and white wires is what connects the 4wd lights)

 

It’s either the backup light switch or 4WD switch connectors