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Bob -- if I can supplement Paul's suggestion:
There's a supplementary speedo cable which comes out the back of the speedometer and runs a short distance to another, smaller box which mounts just up above the lower dashboard frame member. Right above your left knee, as I recall. (My '81 is now in the possession of my younger son in Vermont at the moment, so I can't run outside and check). This smaller box is essentially an egg timer, and it trips the Lambda light in the dashboard when a threshold value of miles has elapsed since the last time the counter was reset (60,000 miles, maybe?). It's *this* box which has the push button reset, not the speedo head assembly itself.
Urban legend has it that if you disconnect this secondary speedo drive cable you ease some of the workload in the primary speedo drive and thereby prolong its life. I've removed them in both of my secondary box-equipped 245s; YMMV.
This reset job is pretty straightforward. About 6 years ago I was driving my elder son in our '83 245 around New England on the college visit tour thing, and we were driving south on I-95 through Connecticut in the rain during the afternoon rush hour. The light went on, and my son got sorta panicky as though something was wrong with the car at an undesireable time and location. I said, 'Not to worry', popped off the little buttons for the dust cover, reached up and pushed the button, and twisted the buttons back on. All on the fly. My son was impressed.
Rob Kuhlman
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