[Tremelune]

I have a 1970 911 and the odo broke in a new way...It rolled over from 39,999 to 39,000 and I fear it'll do it again. It has worked flawlessly for the last 3,000 miles, and continues to count miles (trip odo too), but now it's 1,000 miles off, and I suspect will get worse each thousand.

So. I've replaced that notorious gear before on an 80s car, but I've never had to mess with the cluster of numbers. Has anyone done this themselves? What am I in for? Last time the hard part was simply opening and closing up the speedo without damaging anything, but this time I fear what will be involved with the internals.

North Hollywood Speedometer wants about $400 to repair it, so Im inclined to at least investigate how involved this will be once I get it open...