Technical Using a Speedometer as a Tachometer?

That is exactly what I wanted to know: thanks!

 

https://www.ebay.com/itm/1671829545...eIHCculQee&var=&widget_ver=artemis&media=COPY
An acquaintance of mine on eBay is liquidating his grandfather’s speedometer parts and equipment from his speedometer repair shop.
Bryan has a demagnetizer listed if you’re interested. I purchased many parts and some equipment from him.

 

and @Ned Ludd
Just a follow up to my post # 55
I was up in my ceiling looking for "treasures" and I found this.

This is how I converted a "Smiths" V6 6000 rpm tach to a 4cyl 9000 rpm [keeping it OEM in the dash]
When I printed the face I got a spare made .
On the original Smiths Tach the indexing was printed on to a faux glass face, so I removed this.

If anybody in wanting this "for a good cause" just message me.
calling @Mikko_ [is this something that would suit your Cortina project?] You'll need to find a V6 tach from a Mk4 Zodiac which is a direct fit to the Cortina Dash

 

@Kerrynzl I appreciate the thought but I think the shipping from NZ would be quite high, and hard to find a Zodiac tach around here.

But thanks that you thought of me.