Hunter79764
Full Access Member
- Joined
- Sep 1, 2021
- Posts
- 344
- Reaction score
- 531
- Location
- Grand Prairie, TX
- First Name
- Shawn
- Truck Year
- 1987
- Truck Model
- Suburban V20
- Engine Size
- 350
Stole this from another post, but according to this, the 87+ selector controls the TBI in tank pumps, you could easily have it trigger a couple of relays to keep the current out of the factory selector but still maintain just the factory switch. 920 - Tan would give a 12v signal to your supplied relay to handle the current to the aftermarket pump in the Left tank, and 921 - gray gives 12v to the Right pump.
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