This is the bypass module that I was talking about. You can score one for about $30 on ebay. It will work for 98 - 00 rangers.
If you have a 01 - 05 ranger, then you will need a 556U. Which means that on these years you will loose a key. You can score this one on ebay for about $25. Here is a pic of it.
1999 FORD RANGER XLT 4X4 SUPERCAB 3.0L FFV
SUPERLIFT REAR ADD-A-LEAF; AMERICAN RACING WHEELS; BFG ALL-TERRIAN 31X10.5R15
WESTIN SAFARI BAR; HELLA 500 DRIVING LIGHTS; 99 2WD GRILL WITH A STULL BILLET GRILL
2003 TAILIGHTS WITH CONVERTED HARNES TO ACCEPT 2 BULBS
TINTED WINDOWS 6% REAR, 32% FRONT 2 DOORS
UWS DIAMOND PLATE TOOL BOX, WESTIN BED EXTENDER, TRAIL FX BEDLINER
FULL STREREO WITH SUBS
VIPER 5000 2 WAY RESPONDER ALARM WITH BACKUP BATTERY, GLASS BREAK SENSOR, 2 SHOCK SENSORS, AND HOOD SENSOR