Finding a ground in the gauge cluster pin

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Joined
May 31, 2022
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Location
Europe
First Name
Caleb
Truck Year
1985
Truck Model
C10 Silverado Longbed
Engine Size
334
I'm in the process of messing up the wiring of the gauges. As I succesfully made an oil pressure warning light out of the warning lights under the speedometer I also accidentally cut one wire that was needed for the fuel gauge to work (in the pic there is a black jumper wire I soldered to fix it, unsuccesfully). Now I have been trying to figure out how to make it work again. Can anyone specify what are the roles of the three connectors behind the fuel gauge?

Also my plan was to route the +wire of a realay switch that uses the TH700 converter lockup via the warning lights under the fuel gauge to have a light that shows when the lockup is on, and for that I'd like to find free spots on the pin that I can safely take for the wires (4x4 warning, seatbelt warning, choke warning etc. unnecessary stuff)? Does anyone have a chart of the pins/wires on the connector (pictured)

No, I dont know what I'm doing with the electrics all the time, but sometimes I succeed and I'm learning ;)
 

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