Hmmmm.... I'm thinking now on this pump RPM issue... Motorbike electronic RPM gauges that you just clamp a sensor onto a HT Lead? Could similar idea be applied to clamp onto pump power cable or pump body?? (Dunno - my bike uses old analogue RPM cable so never played with em to know how they function etc).
Mind you, iirc those are expensive anyways, so probably not a cost effective consideration...
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