I would get a carb cluster and wire it how the carb'd car would have originally come, because even if you can wire the sensors to the cluster, it's likely they will read wrong (different sensor outputs, ranges, voltages, resistances, you get the point).
for example, the engine temp gauge on a carb'd cluster might be looking for a 10ohm-100ohm resistance output from the coolant temp sensor, while a fuel injected cluster might be set up to read a 1ohm - 10ohm sensor output. So you'd wire the sensor into the wrong cluster and it would be constantly pinged on hot for example.
You could also take the sensors off a fuel injected motor, hope they work or make them work (adapters if different thread pitches, etc.), and wire them to the cluster yourself, but that would take quite a bit of understanding of how the systems work, some large balls, and a huge pain in the ass.
or you could just buy a whole set of autometer gauges, make/buy an instrument panel, and wire them up as per instructions.
or you could just convert it to fuel injection and save yourself a lot of time and money. O0
