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Hook a RELIABLE gauge up to the car, if you can't find a place to tap it in then replace the sender and tap it in there. The stock gauge is useless and 9 outta 10 Z's I've seen it's broken, usually due to the sending unit. Most aftermarket gauges will have there own sending unit you just tap into an oil feed line. First thing is you need is a 100% accurate way to measure the oil pressure. You said you had a cheap gauge, is it accurate? It's normal for your oil pressure to drop as the car warms up. Should be like 60psi at cold start and around 20-25psi when it's warm. Check your oil level. If your in doubt add half a quart. If your gauge works then start checking other things. Oil pan, oil pickup, oil pump, oil filter could all cause this. The ticking you hear is your VTC or lifters. It's from metal on metal contact due to oil starvation. You can also cause dirt to enter your lifters when the oil is low which would result in the lifter not pumping up properly when your oil pressure is fixed. This will create ticking lifters permantly. DO NOT DRIVE THE CAR LIKE THIS!! 5-10 psi is way to low and WILL cause damage, possiably leading to a pricy rebuild. It's a PITA to pull the oil pan and check everything but its much easier then doing lifters or a rebuild. One question.. When you did the swap did you not replace the oil pump? Did they check the pickup when the pan was straightened? If your pan got smashed its VERY likely the pickup was damaged or knocked loose.
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