What gauges are you running? I am currently running the VHX gauges and just have the CEL wire from the GMPP bulkhead wired directly into their control box. I used the have an LT1 (before the LS3) using an another companies EFI harness and it did provide the negative side of the circuit from the PCM side. I just had to hook the other side of the LED to an IGN source.
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Chris
1968 Camaro SS
LS3/T56
Full of DSE and Holley parts
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