scotch
+1y
I just looked up your truck online and it looks like it has the newer style front end and the newer dash and instrument cluster. So this probably won't help much, but I'll post the links anyway for a US 1991 B2600i. Good chance the rear harness is unchanged. As for the cluster, it's probably similar and maybe you might find it useful.
Fuel Pump & Gauge:
Instrument Cluster: