that sucks.
hooray for analog pressure and spring gauges!
To be honest a 93' caravan isn't worth 900.
But if you want it fixed, search ebay or any local pull parts place for a used BCM and then search the interwebs on how to install it yourself. It should be a "simple" unplug-replug process but not sure how hard or easy it would be to get to it.
These are the words you wish you wrote down.