Need help with Relay part #
 

What is the silver rectangular relay behind the gas gauge on a 1975 911?
The part # is:

911.617.118.00

Does anyone have a new/used one for sale?

Thanks!

my book say "seat belt interlock"
my 75, has a round black one there in that location. in the truck tucked up way in the back by the gauges right? by the hood shock lifter thingamajiggy?

That is correct, it is the seatbelt interlock. It's easier to get to it if you just pull the fuel gauge, but it's supposed to be silver and rectangular. Should say "Logik Relay". Anyway because of safety reasons back then, the ignition is also wired in there (yellow wires), so if the relay is busted or you take it out, car won't start. Porsche does not carry it any longer but I need to find another one, NOS if possible or good used. Anyone knows where I can get one?

Thanks!