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You are a machinest well good for you because you can make a speedo gear for the speedo unit,the small gear using nylon.I have done it so you can .The change in OD will change the distance the gears center needs to be from the trans output shaft .Figure the diameter and the differance of the stock diameter and then you will know if you will need to cut the mounting hole from the side of the trans and weld it back in the correct place.You could make a mount and make the hole adjustable changes later .Being a mechinest opens the world to you ,think it out and be proud of what you do .Good skill to you.
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