I have a civic hb with a zc swap. The car does not overheat but when I step on it the temp gauge cools way down almost to 150. Then when I start driving normal the temp does back up to about 200. I have tryed replacing the thermostat but did not help any. Also, when it is cold like this it will not rev over 7000 rpm with a pg7 ecu. It seems like it starts cooling down at about 4500rpm. Could this be the water pump?

 

Is it an aftermarket gauge? They don't work like factory gauges.
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yes, it is an autometer gauge. the only thing that really conserns me is that it won't rev over 7000rpm and makes it slower

 

anyone have any idea's?