The wire to the battery disconected from the alternator somewhere on the A303 from Yeovilton. I made it to Andover before I called the AA. In that time, the Tachometer stopped. The clock stopped. Apparently, I was doing 20 gallons to the mile at the rate my fuel guage was dropping. The Voltmeter was in the red (as you would expect). And I had no oil pressure. But, the engine ran for miles and miles. Eventually hiccupping enough for me to stop at a friendy Starbucks.
Watching the gauges, I thought that it was an electrical problem (rather than oil pressure). Which it proved to be looking at the alternator. If only I had had a crimping tool and a connector, I need not have called the AA. But how oftern do you need those in the car?