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Hi guys, does someone knows where the brass connection must be connected to ?
This is the back from a rev counter from a Mini 1275GT, it's not working at the moment.

Thanks in advance, Kees

From memory:

Male spade is a 12V supply on a G wire
Male bullet is an ignition 12V supply on a W wire
Female bullet goes to +ve connection on coil with a W/G wire

It will also require an earth - this should be a terminal on the PCB terminal secured by a screw into the hole next to the female bullet socket, but you could run it as a wire with a ring terminal

Thanks will pass it on to my mate

Has your mate converted to electronic ignition?

Yes he did.

Then this type of rev counter may not work - its and RVI and he'd need an RVC.
Spidya designs do a conversion board though:
https://spiyda.com/smiths-rvi-rvc-conversion-board.html

I'll probably mis-speak so someone please correct me - but if your tach has an 'RVI' in the lower corner of the face you'll need a different one (or I believe you can have it converted?) for use with electronic ignition - the RVC tach is for electronic ignition. The wiring is also different. I'm still going through it myself so have no hands on experience with it.

One of many threads here:

https://www.theminiforum.co.uk/forums/t ... v-counter/

Pat