stupid gas diesel ?? on 84 xj 2.8l v6

I have an 84 xj 2.8l v6. I know that almost all diesel engines are diesel only. But there are a few engines that can run just about everything. Or converted easily from gas to diesel or vis versa.
So I run unleaded fuel. My xj runs normally. But my dash lights have a spot that says diesel on it. Was my xj once diesel converted to gas. Or does the xj just all have the diesel light on 84s. Also anyone know stats on the 84 v6 that is diesel.

No, your XJ will not run on diesel.

AMC is cheap, they use the same cluster for every version of the XJ including the diesel one.