Vintage rev counters...

[Ruairidh Dunford]

Thank you all for your very interesting and helpful replies - much appreciated!

Ruairidh

[Alan Croft]

Hi Ruairidh

Depends how authentic and accurate you want to be.  I use a cheap Chinese import which seems to run well.  From memory it was £25. I made up the black bezel and glued it to the chrome rim.

Cheers

Howard

Hi Howard,

don’t suppose you have a link to one of these please? Thanks 

Alan

[Howard Wright]

Hi Alan

Further memory jogging and it’s Indian not Chinese.  I no longer have it on my eBay purchase list as it’s over a year since I bought it but this one is close.

https://www.ebay.co.uk/itm/Counter-Clock...890.l49292

If you enter Smiths replica tachometer in the eBay search quite a few come up.

As I mentioned to Jon in the thread. It says 2.1 but mine turned out to be 4.1 so I had to prise open the bezel scan the dial and change the numbers in my photo app.  Also I made up the black surround to make it look more vintage.

Cheers

Howard

[Alan Croft]

Thank you, much appreciated. I have all the dials that came with my ruby chassis so this was one I was pondering how to do

[JonE]

Mechanical drive off the bottom of the distributor.  

Ludicrous - there are some on ebay presently for 13.95 posted!! How in practice does one do the mechanical drive connection please? I see I have one dynamo which has a hole under the distributor, so I suppose that might be something to do with something that has been done in the past?

[Howard Wright]

    Hi Jon

A hole directly under the distributor drive would indicate the possible take off point for a tachometer drive. 

I turned up a thick tube that just slide down the distributor drive shaft in the housing and was a sliding fit to a long drill I have.  That ensures the hole is directly in line with drive shaft.

The cable I used has a fine M12 thread connector both ends and fits the tachometer at one end. So I drilled a short length of studding to take a brass rod with a tongue at one end to fit a slot cut in the base of the distributor drive shaft.  The other end was drilled and filed to form a square hole to take the drive cable. I silver soldered a thin washer on the end of the studding to form a collar.

Hope these pictures help

Cheers

Howard

[richard wyatt]

It 's sixty years since I did a mechanical tacho drive using bits from Super Accessories {I think,possibly Cambridge}} It involved cutting a slot in the base of the distributor spindle to mate with a spade cable end and the aforesaid hole in the distributor body;it worked.

[Charles P]

Available now on Ebay from a well know supplier
https://www.ebay.co.uk/itm/austin-7-seve...SwCQ1frr0S

c

[Steve Jones]

And here's the bit to go on the other end:

https://www.ebay.co.uk/itm/Austin-Seven-...100623.m-1

Steve

[Austin in the Shed]

It doesn't actually say it's calibrated for a 2:1 or 4:1 drive.
I believe he's sold several 100 mph faced speedos .