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First hook up a mechanical pressure gauge to get a true reading--you may just have a bad sender. If pressure is less than 10 to 15 psi at hot dead idle, tell us how many miles on engine--what oil you are using--how often you change it. I have sometimes gone up one notch on thickness of oil on worn engines and run them many more miles.
Old engine tend to wear piston ring in time,if you use wrong viscosity grade oil ,during idling the oil could not reach all moving parts because there is no enough oil pressure in the system,try 30/ 40 oil grade .
Well the volt meter would drop a notch or two with the extra load of the headlights at idle. But the oil pressure should not change. Could be a ground problem in the harness or the connector. Could also be something with the printed circuit board for the cluster.
Sound like either the Thermometer Housing, Thermometer or water pump may be in trouble.
If no leaks you can rule out the Thermometer Housing.
But regardless you will need to replace all three if any one is bad.
And the timing Belt while you are in there,
Only because it a 5 hour Minimum Labor job to replace either of them.
And there all right near one another,
new rad and they are expensive about 500euros last time i bought one ,are the rad shrouds in place and not thrown away by a short tempered mechanic ?? as for oil pressure well thats a engine rebuild and a crank regrind
ok. oil ight is probably nothing more than a faulty pressure switch.You can have pressure checked at same screw in port. 15psi is ok...just. very cheap to replace. Ign control module is probably the cut-out fault. You cant really test it; repair by substitution is the trick.
Well it could be bad oil pump or worn connecting rod bearing/main bearing or even worn journal or clogged oil ports.The system bypasses the filter if its clogged so its not the filter. Location of the pump in front cover where the chain is and its spun by the crankshaft. It right behind the crankshaft pulley/damper. Its not a very difficult job but its not that easy, its alot of work. Good Luck