Originally Posted by Jester983
I have no tach (thanks again ford engineers)
The tach was optional on your year truck and the owner chose to buy it without one. And, OBTW, engineers don't decide vehicle content. Marketing people do that based on studies of customer wants versus the price they are willing to pay.
As to your light, your alternator is probably on its way out. The engine and alternator can't overrev on accel because the engine has an RPM limiter. The engineers were responsible for that.