Tachometer for Mk1

[mk1coopers]

Here's the 7000 rpm smiths one I have, I don't really need it so if someone wants to make use of it I can put it in the for sale section, it's untested.

[GraemeC]

I like that, is it 80mm and I wonder if it will work on -ve earth?

[mk1]

Its ridiculously simple to swap polarity on the car if needs be.

[GraemeC]

Thanks Mark,. Yes swapping the car isn't difficult, but I'd rather keep it the more commonly understood -ve Earth than change it just suit a tacho.

[mk1]

Good call

[GraemeC]

Just need to find a sensibly priced 80mm one that doesn't bounce around like its on acid.
Don't want to spend much as I only use it for noise test in scrote-ineering

[mk1]

that doesn't bounce around like its on acid.

You can exclude all the "classic" second hand ones then.

Something like this is a good bet.

https://www.merlinmotorsport.co.uk/p/ra ... eter-rttc8

[GraemeC]

That would work, f I can find one at reasonable cost.
eBay.......

[mk1coopers]

I like that, is it 80mm and I wonder if it will work on -ve earth?

Yes 80mm, I picked it up ages ago as I'd not seen one like it before