Hi everyone,

I had a smiths tacho installed by the guy who services my ‘69 Mk2 Mini and it has never run accurately. After running the car for 5-10 minutes it will register 4000rpm at idle !!

Also the glass was broken during installation

Any advice on what I should look for to resolve the tacho issue and also thoughts on replacing the glass?

Also, the garage were great - not criticising them at all

Cheers

What make and model tacho?

_________________
ex-NSW Police 1970 MK II Cooper S
VMCI #43

It’s a Smith 8000RPM 80mm Tachometer part reference: RVC1006-00CB

Cheers

While awaiting comments from others perhaps have a look at this publication.

https://img1.wsimg.com/blobby/go/1975f8 ... 6555388667

_________________
ex-NSW Police 1970 MK II Cooper S
VMCI #43

RVC should mean suitable for electronic ignition...take a section of the glass to a glassworks and get them to cut you a new one (including drilling the hole in the centre) or contact an instrument shop near you (check out the Mini Businesses thread...)

_________________
"Show me the Mini!"

There are conversion and or replacement circuits for these Smiths tachos in the UK for DYI use:
https://www.spiyda.com/tachometer-electronics.html

Otherwise you will need an instrument repairer, who might have access to a replacement crystal. Most Smiths tachos have a plastic "glass" with the red pointer riveted onto it.
Removing the bezel without damage is a patience tester!