Lincoln SIP relay


Does anyone have info regarding the (SIP) relay, to turn on the Low Fuel light?
If I don't get anything here, I will re-invent the wheel and make one in solid state. I figure if it's already done, I need to look at it.
The original SIP was made by K-S (King-Seeley), as were all the gauges and CVRs.

Thanks in advance for your help. Anyone? - Dave