So, how is this done?
Anyone got a sketch / pic of the wiring to do this

You need a wide band controller such as this Tech Edge 2j unit. and an LSU 4.2 bosch sensor.

The Apexi pen timer is wired to the controllers 0-5v wideband output.

you then adjust the voltage & AFR references in the apexi pen in relation to the 2j's output/afr ref. scale.

Job done.

It's easier to buy the ld02 display with the controller & build/use that.

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Agree that it may be easier to just get the display but i'm not keen on having a cockpit full of gauges, etc
like to use what's already installed. the apexi unit is nice and simple and also nicely tucked away in the corner.

thanks for the site