You said "...Then the tachometer went dead and the battery light above the fuel meter came on...."
Well, I had this scenario on my 98 Disco LSE once during a freezing winter. It turned out to be the electrical system failure: alternator that was dying, battery was thirsty, and the belt was shining, whistling due to the wear! Basically everything was not getting enough juice to keep the truck power everything (Fuel system, ABS, power steering, Lights, stereo...). This occured in 120k mi.
Action 1:
-Replaced the "couple" alternator - battery: Alt with the high output Magnetti Marelli, charged my battery. The truck was back on road but still the RPM tachometer needle took a nap and did not wake up at all!
Action2:
-Checked connections, browsed the web, asked ASE guys, ... tightened tensioner in vain. I could see the RPM needle just shaking without reaching the regular 720 rpm idle.
Action3:
Guess what! I made an executive decision to go get a new serpentine belt, snaped it in, turned the ignition key, "Et Voila" the RPM tachometer needle up and swinging again! Everything was back to life!
I understand your alternator is ordered but do not forget to service the serpentine and shiny pulleys!
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