You'll need to keep parts of the old harness like the connector at the drivers side firewall, it will come in handy when you have to run wires into the cab. If you decide to use the 3-wire temperature sensor you can cut the TPS sensor pigtail from the tbi harness and wire it onto your 5.3 harness since the plugs are the same.
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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