Ahh, yes I remember the rattly unit now. I also remember the charges that Racelogic put on supposed, 'no fault found' units. Sadly, I don't have any kicking around any more. But when you do get to plug another one in, once you've set it up, if you're still seeing those spikes on the wheelspeed sensors, I would first try to fit some pull up resistors. I suggested to Racelogic, that this be built into the units years ago, as I found the problem on several cars. It was dismissed at the time though, as a redesign would be too costly, and affected such a small number of cars it wasn't worth it.
I'm now living in East Ruston, not too far from North Walsham. 'Tis a strange place, where these 'North-Folk' live. Full of strange place names, spelled in ways that make absolutely no sense to the British language in their pronunciation! - Happisburgh = Hazebro, Wymondham = Windum, Hautbois = Hobbis, Costessey = Cossey... And they're just the ones near me!!!