I purchesed a 90 civic si instrument panel off of ebay, and I'm trying to put it in my 90 civic. Everything hooks up right, but i need to re-wire it so everything wil work right. Ex when I turn the lights on the fuel gauge goes all the way to full.

 

Despite popular belief. The 88-89 and the 90-91 guage cluster is not the same. You should make sure the one you purchased from ebay is from a 90-91.
I have a 88 HF and if when i tried a cluster from a 90 HF and a 91 SI neither one would give me a fuel or temp reading.

 

some of the pin locations from the 88-89 gauge cluster harness is different from the 90-91 harness. i had to switch around 4 or 5 wires when i did my 90 si gauge cluster swap into my 89 hf.

 

i switched some wires around and eveything works but the fuel and the temp gauge. And my car wont go past 4500 rpm. I dont know whats wrong. So one help please.