sounds like a normal 1200 tacho, that may connect to wires taped to your loom. As it was likely an option even on the 2003 utes.
Otherwise you'll need to refer to the 1200 wiring diagram that shows that the tach loop just sits in line with the ignition wire to the coil. If you wire it backwards the tacho needle will go in the wrong direction. Find a diagram. 2003 model Utes are a ZA specialty