Can anyone shed any light on how to make the tachometer in my 1200 ute work

Factory? Aftermarket?

Factory, I know there are two wires for lights but where are the other two wires meant to go?

did this originaly have a clock instead of a tacho???? if so i think what i did on my old sedan is i ran two wires one from each of the wires on the back of the tacho and used them to open circuit the wire that goes to neg termeil of the coil..

I can't say for sure but there should be a couple of black wires back taped to your origional wiring harness. All the old 1200's I have owned in the past had them. They usually utilizes the same harness to do all the models.

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As revhead said, there should be two wires in the harness right near to where the tacho is normally located. They should be black with a white stripe. They actually break the positive (as in +) of the coil, not the negative(as in -). The pair should be a male and female connector and be connected to complete the circuit since there weren't a tacho in there. Just pull them appart, and plug into the respective wires on the tacho. You're good to go...

If you can't find them, simply break the positive going to the coil somewhere near the ignition, loop back through the wires on the tacho, and it should work.

The negative is broken by the points, and wouldn't actually run anywhere near where the tacho sits, so that will be far more wiring and work.

PS. When I was sorting out my car's wiring, I stripped the entire harness, and that's why I know that they are the positive. While doing this I had a half dead battery and charger connected at the normal terminals. Because of the wave in the charger's voltage, it registred 2000 rpm as soon as I connected the two wires...

I have an '84 B120 [1200 ute] and there are no wires in the dash loom for the tacho.
As previously advised, you need to run a pair of wires from the tacho. to the points side of the ballast resistor.
One wire connects to the resistor, the other to the wire that was previously on the ballast resistor.
You are simply extending the ignition wire back into the cabin, through the tacho. then back to the ballast resistor.
As a security measure, you could put a hidden toggle switch in series with these wires to give you a KILL SWITCH
There should be short wire on the rear of the tacho. with a female bullet connector on it.
That plugs into the main instruments to pick up 12V, just like the clock did.

I have this early 1200 tacho that i ordered sometime ago, and just trying to install it now and for some reason i cant get it to work. i followed the diagram for this type of tacho and still have the same issue.

how can you determine if the tacho is defective?

Thanks for the link mate, that's the same tach that i got. Im not looking for one right now but if tacho that I have is not gonna work then I may have to.