Hi Eds, thanks for the response.

The LM-2 Has two analogue out wires though, Green+ and Yellow- and according to the manual can also be setup as a differential input with an extra earth. 3 different diagrams shown.

When I measured the Green to earth, it was over 7 Volts at 20.9 AFR.

The Green is the one that should be connected to the Grey/Red wire as you have stated, but that is a port expecting to see 5V MAX....

Hence my concern!

Its possible that connecting the Yellow wire to the Ref Ground-the black wire is all that is required, the differential across the two is less than 5 Volts, but I do not know that is correct for sure.

The 3RD Grey wire not being used at all.

The LM-2 has this two wire system, the MTX has a 1 wire system so may be slightly different again.

As Steveo and some others have done it I was hoping one of them could chime in and confirm what to do.

The 92/93 ECM's are very rare now and are expensive so I would rather not damage the input port by making an assumption I am not confident with.

Once its finally working I will post back here for others to know the exact things to do...

Cheers
Kevin