Tacho wiring diagrams

Having been considering a tacho/rev counter for a while now (Mk1 PIs do not have one as standard) I started thinking about what, where and more importantly how I would fit it. I don't want to bodge a hole in the dash, I don't want to cut out existing instruments and I don't want a modern looking tacho. As ever, my eyes turned to eBay and there's a bewildering array of instruments, often without instructions or wiring diagrams. In my quest for information, I stumbled across this and thought it was worth sharing

I still haven't got a tacho but I do have a reasonable idea of how to mount it and what sort of tacho would be OK. Ideally I'd like a works type pod like on FHP993C so I can put a fuel pressure gauge up in view but that might be a little tricky to find - my car isn't a replica so I don't have to be a slave to originality but I would like to keep it period looking as far as possible
From FHP993C - At Canley Classics July 2007

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