clifford alarm, trigger wires

blue and WHITE/ black

Is that a Clifford NOT DEI dual zone prox? If so it probably won't work with the Call Guard because it's digital sending data not a voltage, check with Armour Auto and ask for Carl, that's DEI's UK tech. these days. Use the brown siren output or secondary siren output relay converted to feed pos. to the Call Guard it's far simpler. Also watch the aerial on the Call Guard, very fragile.