20V A/F Meter

[MEX]

i was given a 20V a/f meter the other day and was told it should plug striaght into my 4k efi, the plug is exactly the same and it does plug in, but the car doesnt sense it(engine cheack light comes on, same as when the factory a/f meter is unplugged), i was wondering if anyone knows weather this should work?(was thinking the a/f meter might be stuffed)

[shaggz]

in theory it should work i think but sounds like it may be bung dude

[MEX]

thats what i thought cheers