When the trasmission stopped shifting out of 1st gear the speedometer stopped working at the same time. The tachometer still works. Reverse and park still work also. 1st gear works well I just can't get anywhere very fast :)
How to fix 2000 Taurus transmission problem. won't shift out of 1st gear. on 2000 Ford Taurus
I'm having EXACT same issue. Can't get it to a service place without towing. Have called a few dealers for recall or service help. Will be watching to see what you find out. If I get an answer , I will post .
scan codes and post so we can adv.aamco will diag for free