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I'm still here, folks. Just heavily distracted with other things recently. I've been taking note of the many suggestions, have obtained some hardware, and look forward to when I can spend a couple of days trying out various options. I have a simple CRO to help me see what's going on. Thanks all...

There's lots to read on that link, thanks. I also found an old thread on this forum with some filter circuits to try.

Thank you for the welcome and replies. LM2907 is interesting, but I'd prefer to try a Picaxe first. I'll keep it in mind though. I did consider a charge indicator for sensing, but if that circuit failed the starter inhibitor wouldn't work, so not fail-safe. There is no oil pressure switch on...

On an old vehicle with no ECU, but with Hall Effect "points replacement" device: I want to count ignition pulses, and I gather a method is to use an inductive or capactive sensor with a spark plug lead. However, I'm wondering if I could use the low tension wire at the ignition coil terminal? I...

Can the speed of the servo movement be slowed? I'd like to change it from a fraction of a second, to something like 5 seconds if it's possible.