Need help ID'ing wires and connectorsee

[SnMMan]

Hello everyone,

I just picked up a 1988 Silverado c1500 regarding cab long box with a 305 and auto. The head gasket was blown on it so I tackled it with my buddy. It went smoothly for being our first time. The questions I have are about a couple wires/connectors that have no where to plug in.

 

1. There are 3 wires coming out from the firewall behind the engine

2. There's a connector at the rear of the block that goes nowhere

3. Another connector at the front

4. Looks to be a missing vacuum line on the what I assume is the pcv sensor?

 

Anyways this is my first older truck and I'm just starting to learn my way around.

 

I will post pics as soon as I figure out how.

[SnMMan]

Here are the pictures!

[slj2008]

I think the wires are - fuel gauge, oil sender , temp sensor . oil sender block . temp on top , ???? its bin 50 yrs ago since I did this. Good luck

[THORX4]

id plug the vacuum leak for sure. As for wires what he said sounds about right.

[sledog]

The last pic is circling a white wire with a connector. That is a aux tach wire that is not used