5 replies to this topic

[Keisar]

Gentleman, 

 

I plan to replace the standard cooper bloc of 3 gauges by smith gauge. I don't want something like the central gauge bloc.

 

In my mind the critical one is the speedo because it's mechanical. 

 

Do you know how to adapt this type of gauge on a 91 mini cooper ? This model is just an example. 

 

Thank you. 

 

[timmy850]

That speedo has 1000TPM (turns per mile). I don't know what your current speedo TPM is, but the below link can help you find it.

http://www.guess-wor...Tech/speedo.htm

 

If you put in the gearbox details in the link below, you can figure out which worm and pinion gear would work to be the correct drive for the 1000TPM speedo

http://www.guess-wor.../Tech/ratio.htm

 

 

[peter-b]

The speedo you pick car be 'adjusted' to read correct speed by an instrument repairer, if you can't find an exact match for gear. It just meens the odometer might not be 100% accurate.

[gazza82]

check out speedycables website for info on speedo recalibration

 

http://www.speedycab...alibration.html

[dklawson]

To elaborate on the comments above... yes the gauge can be recalibrated but it will be quite expensive and rather depressing to have to buy a brand new instrument like you have chosen and promptly turn around and spend a lot of money modifying it to be right for your car.   

 

Hopefully the information on the GuessWorks web site (linked above) will provide you the information you need to change the speedometer drive gears in the gearbox to get close to 1000 TPM.  

 

If that does not prove to be possible, you can contact speedometer repair companies and ask about buying a ratio box.  The ratio boxes mount inline with the speedometer cable.  They have internal gearing to provide a conversion between the TPM coming out of the transmission and what the speedometer needs.  

[Spider]

As a cheap option and IMO, easier to install and set up, would you consider an electronic speedo

 

https://www.merlinmo...diameter-cb-100

 

with a sender

 

http://www.digital-s...apter-158-p.asp

 

???

 

Seriously, dead easy to fit up and calibrate. Also, you can fine tune the calibration, and if you ever go for different tyres or change the final drive, re-calibration takes less than 5 minutes (including working out what error you need to adjust out) and requires little more than the press of a button.

 

I did a similar set up a few years back (as I wanted a resetable trip meter) and I have to say, i was surprised at how easy the how shebang was.

Edited by Moke Spider, 22 September 2015 - 07:50 PM.