Typically when the ECM is DOA, the fuel and battery gauges won't provide any reading. Given that your vehicle somewhat running, it sounds like the ECM is at least partially functioning. However, I agree with new2site (and trust me, that doesn't happen often), before going down the road to ECM replacement, check, clean and verify all your ground and power cables. WJ's, and Chrysler products in general, are prone to some goofy issues when not properly grounded or the power cables have corrosion. On the power cable in particular I would recommend breaking out the volt meter and checking resistance, since corrosion can build up under the cable sheathing even though the terminal is clean.
Don't forget, there's a ground strap between the transmission mount and exhaust on the underside of the vehicle as well.
'00 WJ 4.7 Limited- Some stuff
'03 WJ 4.7 Laredo- Some more stuff
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It is what Jeeples has *PARTIALLY* stated.