The part number fer the automatic transmission speedometer cable is 8371034080.

From ToyotaPartSales.com I came up with this...

OEM Catalog
Item Number MSRP Core Price Price
8371034080 $69.02 $0.00 $49.79

CABLE ASSY, SPEEDOME


1998 T-100 Xtra cab SR5 2WD Auto; Roadmaster Active Suspension; Yokohama Geolander HT-S; lowered air dam; full belly pan; 4? diffuser; 11" side skirts; dual transmission coolers; 67% grill blocked; Auto-RX'd; ScanGauge II/Ultra-Gauge