I've just fitted a Stack wideband AFR gauge to my cossie - it has a peak recall feature but requires a switched earth at wide-open throttle to trigger the logging function.

I don't want to fit a dedicated switch. I have a SECS monitor and was thinking about using the Water Injection output (a combined MAP and Charge Temp trigger) to do the switching when on boost rather than WOT. Can anybody (Simon? ) assist with this

Failing that I was considering using the TPS - can anybody shed some light on operation of a 4wd TPS? i.e. can I just take TPS signal from the SECS loom and use this directly?

Cheers!

Neil.