Where can you hook up the temp gauge on the engine for a 90 corolla? The shop couldn't find a place so they hooked it on the lower radiator hose. It works only when it idles. When your on the freeway its cold. The old original temp gauge would go 3/4 high when u ideling and its not even overheating. I heard shops say that is normal on these corolla when they do that. I dont do the work myself cause its a work vehicle i use. Thanks