Thank you for your response, Yes I have been slowly bringing myself up to speed with the various options I had come to the same conclusion as you as regards the TC-08, (Once I got my head around what conversion time meant) I think I have found a suitable RPM 'pick up' but this has an 'open collector...

Hi there, Initially I was considering a TC08 to log both temperature and voltage inputs, but I don't think it will be suitable The requirement is to monitor a vehicles start up behaviour, cold cranking and battery voltage, RPM and temps x5 k type x1 Cold Cranking current - TA167 Current clamp input ...