@Andrace I have not got the engines back yet. A mate of mine is rebuilding them for me, both barrels needed re-coating with nikosil, and it was cheaper to re-coat them rather than to re-barrel. I should hopefully get them back in the next couple of weeks.
I spoke with the manufacturer of one set of tuning lights and they think that oxygen sensor should work fine in the KZ, and I have picked up a cheap exhaust to use the sensor in, just in case it does crack the exhaust.
The reason I have gone with the tuning lights over another way, is because the Mychron that I have on the kart will not accept another data input and I have experience using the tuning lights I am going for. They are cheaper than replacing a working Mychron with a unit that has all the bells an whistles.
I suppose also in the back of my mind is that most of the other input types are a number, where to me tuning lights are doing a job for me, converting numbers to an outcome. I know it’s still the machines interpretation of a number but it takes a little bit of thinking out of it for me.
I will be sure to update when I get it back to the track.