There were two types of modules used in 2nd gen trucks with two different non-interchangeable sending units. If your sender looks like the top photo, it is Dodge dealer part number 4897669AB
costs around 70 dollars these days.
If it looks like this one pictured below it's a bit cheaper than the top photo replacement unit but I'm sorry I can't locate a part number but maybe someone else can:
Mostly Stock 1999 Ram 2500 Quad Cab 4X4 Short bed, 24V, 5 speed manual, NV4500HD, NV241HD, model 60 and 80 Dana Diffs, Luke's Link, Raptor RP-100. BIG-D steering brace.