Highest voltage at the dashboard was 13.5v so that doesnt seem to be the problem. Is there some kind of sense wire Im missing from my base model?

Checked the links and found no voltage drop but at the alternator I was getting 14v. This dosent seem high enough to set off the cluster but Ill check the voltages at the cluster to see if anything is funky there(if anyone has a pinout it would be much appreciated) but if not Ill just throw another regulator at it and see if it fixes it.

I'd be checking battery wires and the fusible link near the battery I guess. Bad connections possibly   Those ghia/fairlane clusters had issues with cracked solder joints also at times. I've fixed a few in the past but don't recall that flashing issue for battery before 

I already tore the dash apart and cleaned up the shitty joints and cross checked it with my ghia dash so I dont thing thats the issue but the voltage is testing good at the battery so I cant see what gives.   Heres the video of the issue on the ghia cluster  

the information on the issue for the cluster might start on the previous page to this
it was a common issue even 20yrs ago for the S pack clusters,  i bought an XF with "low oil pressure" cheap once and the issue was just the cluster.     

Ok thanks for the info guys. My xy 9 inch has measured up as 1129MM centres on perches which may be close to correct! ?

I don't have the spac sender in yet but the oil pressure light is glowing dimly while I'm driving although I'm verifying it with a mechanical gauge before worrying about it. I'll probably ditch the spac cluster as that volt gauge issue is pissing me off

don't trust the S pack cluster for flashing oil pressure unless it has been tested with a separate gauge, there's a few threads on here now on how to fix that cluster flashing issue particularly on S pack clusters, but the ghia ones have also done it due to cracked solder joints on the board  

Well the schedule has been moved forward as the oil pressure light started coming on as I was driving, time to find out if the marketplace motor is any good!

A bit off topic but I'm having a problem putting an s pac dash in the XF. When the car is off the volt gauge is normal but when I start it up it climbs all the way up untill only the red segment is blinking, I am having the same problem with the ghia dash. The alternator lamp is working as it should and it tests at 13.3v with a multimeter so it seems like gauge issue.