78 k10 temp and oil sender mess.

[mufwapo]

I saw the post about the 87 tbi and I thought perhaps someone would have more info on my problem. I have a 78 k10 with the original 350, but the PO installed aftermarket mechanical gauges that don't work and I'm trying to hook up the factory gauges instead. I bought both senders from advance auto a few days ago but I can't find the factory wires to hook them up to. Does anyone know where these would come out of the firewall at? Also about center in the drivers side of the block is where the mechanical temp sender is located but it's too small of a hole the thread my sending unit into, is there some other place the factory sending unit was installed? Any help would be appreciated as I'd like to get these hooked up before something bad happens. thank you!