dans78c10
Junior Member
- Joined
- Sep 20, 2025
- Posts
- 13
- Reaction score
- 51
- Location
- Northern Indiana
- First Name
- Dan
- Truck Year
- 1978
- Truck Model
- c10
- Engine Size
- 350
There is a lot of posts about gauges, I searched, apologize if this has been answered somewhere already.
78 C10 350V8 with gauges on dash.
I am looking for the wire that will go to the oil pressure sending unit located at back of engine on china wall.
Looked through a 78 wiring diagram, no luck. AI summary (dummary) suggests a tan wire for oil, and dark green for coolant send unit.
There is a dark green wire (cut off, no connector on it) coming out of the large harness that runs across the firewall behind engine. At the same point on the harness is the wire that goes to the batt. side connector on the distributor. Also at the same point there is a dark blue wire (cut off, no connector on it) that exits there... could this be for the oil sender unit??
I peeled back the cover a bit for this harness, they attach at the block at the firewall, to see the wires and colors.
78 C10 350V8 with gauges on dash.
I am looking for the wire that will go to the oil pressure sending unit located at back of engine on china wall.
Looked through a 78 wiring diagram, no luck. AI summary (dummary) suggests a tan wire for oil, and dark green for coolant send unit.
There is a dark green wire (cut off, no connector on it) coming out of the large harness that runs across the firewall behind engine. At the same point on the harness is the wire that goes to the batt. side connector on the distributor. Also at the same point there is a dark blue wire (cut off, no connector on it) that exits there... could this be for the oil sender unit??
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I peeled back the cover a bit for this harness, they attach at the block at the firewall, to see the wires and colors.
