Just need to confirm the wiring of these two sensors on a stock 1990 civic si? Anybody feel like checking the colors? Maybe I got mine mixed, not sure....

 

Well coolant sensor has 2 options:
1 for ecu n 1 for gauge cluster
O2 is it obd1 or obd0?

You need to be more specific

 

OBDO.

It's the wire connected directly to the coolant sensor I have in question. And, or the engine harness wire for the o2 sensor. Just need to make sure I dont have these two swapped. Thanks for your help, si-r.

 

There is no way you could mix them up because they all have different connectors

 

Been rebuilding a basket. The harness was hacked, connectors missing. These two wires/sensors are the last in question.

One wire is black and of a slightly heavier gauge is that the one for the o2 connector? I've been soldering and extending what's left of the harness.

Thanks for your help. Sorry if I have not been clear.

 

neither sensor should have a black wire. the o2 sensor wire will be shielded (gray silicone cover with white wire under neath), and the water temp should be yellow/green

 

You si-r, are the man. Thanks for sharing your expertise.