1990 Jeep Won't Start

My daughter has a 1990 Jeep that will turn over but not start. I was told by the mechanic that it is the crank position sensor - problem is - we can't find one. Any idea where I can get one of these??

most parts stores have them, very common, what size engine is it?

It has the 4.0L - called all the local auto stores here (O'Reilly's, Napa and AutoZone) and no one has one. Any other ideas? Just need to get the Jeep back running.

what model jeep is it? Where are you located?

I tried all the online parts stores and there is no listing for a 1990 wrangler with a 4.0L. The only listing for a crank sensor ($52.99) is for the 4 cylinder engine. There was a 4.2L six engine for 1990 but it does not have a crank sensor and it has a 2 barrel carb.

I'm sorry it's a Wagoneer - finally found one at Carquest out of town. Apparently this is quite a problem for this year Jeep.