2 replies to this topic

[earthling]

Hi, I am thinking of buying a derelict Mini van. It is 1973 and has had a 1275 metro engine dropped in.  At the moment it seems to have a Clubman type speedo cluster, but I would prefer to have the original type centre speedo.  Am I going to have problems with calibration, will I have to get a specific type of speedo? 

 

Thank you 

 

Adam 

[sansamn]

It all depends on your diff ratio and wheel choice. This will give you a Turns Per Mile (TPI) number.

Guess Works engine number decoder should give you the diff ration (assuming that it hasn’t been changes)

 

http://www.guess-works.com/Tech/engine.htm

 

Now you know your diff ratio use this site along with your wheel choice to work out the TPI

 

http://www.tomsminisite.co.uk/speedo_calculator.php

 

For centre speedos the TPI number is listed on the right hand side under the millage (it’s a 4 digit number)

 

More than likely a 1280 TPI Smiths speedo will be OK and these are pretty comon

[earthling]

Thank you that is all extremely helpful. Seasons greetings

A