you'd need an 02 sensor... flange or screw type will do.
single wires take time to heat up. 3 or 4 wire 02 sensors are a bit more complicated to wire... but its very doable.
for carbed engines its easier if you're still using the stock exhaust manifold. just look for the efi version of your engine, get the secodaries (just before the flex pipe) and bolt it on to your existing exhaust manifold...
but if you're running on custom made or aftermarket headers and if it doesn't come with the nut or flange thing to screw or bolt the 02 sensor, you'd have to drill your secondaries and weld an adaptor in place.
wiring a single wire 02 sensor is straight forward... just connect the wire from the 02 sensor to the sensor wire of the gauge (usualy gray)... then the red one goes to a live 12v source, and black is earthed.