Tach, Fuel_pump – Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software User Manual
Page 11
BigStuff3 Pro SEFI System (LS1)
Version 1.0
10
Tach (Tachometer) – Green Wire
This wire supplies a generic Tach “out” signal and will drive most traditional tachometers. A 4-
pulse per revolution, for a V8 engine, is outputted.
High Side (HS) GM Fuel Pump (FP) – (Single lead Packard connector with a single red and
white striped wire)
This connector must go to the positive side of a fuel pump relay, not directly to the fuel pump.
Terminating this connection directly to a fuel pump
will damage the Big Stuff controller
and will void the warranty!
The fan connector is identical to the fuel pump connector(s); so
make sure the wire label is read to ensure the connector is terminated correctly. The fuel pump
relay and wiring provisions are not supplied with the system. Contact your BigStuff system
dealers for a relay and/or further details.
Low Side (LS) Fuel Pump (FP) – (Single lead Packard connector with a single black wire)
This connector must go to the negative side of a fuel pump relay, not directly to the fuel pump.
Terminating this connection directly to a fuel pump
will damage the Big Stuff controller
and will void the warranty!
The fan connector is identical to the fuel pump connector(s); so
make sure the wire label is read to ensure the connector is terminated correctly. The fuel pump
relay and wiring provisions are not supplied with the system. Contact your BigStuff system
dealers for a relay and/or further details.