Originally Posted by
flattopwill
Well I can't figure out which cluster wire to tap into. The diagrams I looked at showed more than one speedometer related wire. One from speed sensor, one from the ECM labeled vss, and I think one more.
I think I read somewhere that pre-91 trucks have the drac box in the cluster.
As far as I know its pre-92. My truck(91) didn't have one, but my brothers 93 did. You should have two wires running from the trans. directly to your cluster, lt. grn/blk and a ppl/wht. I got no idea how to hook it up though, I swapped to a 95+ interor long ago, much simpler wiring. I've got a 91 wiring service manual if you need to know what wire runs where.
1991 Silverado-L33 5.3L, 212/218 .557 .562 115+4, ASP under drive pulley,180* thermostat, 90mm truck intake w/ LS3 throttle body. Shoenfeld conversion headers and duel Flowmaster exhaust. Performabuilt LVL 1 transmission and 23-2500 stall converter.
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