It's probably supposed to be plug and play, but on my 5/1985 FJ-60, I didn't seem to have the socket on the wiring harness. The inclinometer came with a four terminal plug: one always hot lead from the battery (to keep the clock time), one swtiched lead (to display the clock time), one lead for the instrument light and one ground. This is the message I got from SOR Tech:
"There are green wires for dash lighting, and black wire for ground. The blue and red are for the clock. One of these is for the clock memory the other is to show the clock read-out and is generally switched with the ignition. You can not really damage the unit hooking it up wrong."
For the battery, switched and ground leads, I spliced into wires going to my non-stock radio wiring. The PO had cut the OEM radio leads and had pulled in sources from other places anyway. I pulled the insturment light feed from one my ARB locker switches, since I had already cut into the OEM harness for that. Recently I've been trying to limit the number of mods (cuts and splices) I make to the OEM harness.
The instrument light in the inclinometer doesn't dim with the rheostat. To do this you would need two separate wires, one for the 12v feed from the running light switch and one "ground" back to the rheostat. The inclinometer only comes with one light feed and one common ground. But I think the inclinometer is far enough away from the driver that it doesn't really matter. The clock light is brighter when the instrument lights are OFF and dims when the lights are turned on. I guess the thinking is that at night, the clock light doesn't need to be as bright to read. That's cool.
