[Benjamin]

As noted above, the plastic internal speedometer drive gear is interchangeable between an NP203 and NP205. Getting the plastic gear out of the original 203 was easy enough, but opening up the 205 was a little more challenging. I had to unbolt the driveshaft and do all the work on my back underneath a stock-height truck....

Got it all put back together, took it for a test drive, and I have a functioning speedometer again.

Thanks for all the help hatzie, I couldn't have done it without you.

Stripped gear pictured below.