There absolutely is. If no one beats me to it it’s in the manual, but it’s not much different to most engines. 0.5-1bar at idle up to 4 bar at revs st engine operating temps (exact figures to be verified).
More numbers here also : DISCO3.CO.UK - View topic - Tdv6 oil pressure
Ok so you do have some suspicions - as the belts are being done then I would be thinking the same - actually only about $170 in parts from Ford ($450 from LR) - the only issue is getting the crank bolt off which need the crank to be locked - starter needs to come out to get the relevant pin in.
For that price I would be doing it.
By the time you stuff around getting the gear and fittings to test oil pressure you would be well on the way to buying the new oil pump.
Garry
I think you will find that the Ford oil pump comes with the oil seal, gasket etc (all in LR packaging) - you only need the new crank bolt.
Bonus. The LR one doesn't according to microcat listings.
According to Microcat 2 x 1346539 oil pump seals are required:
https://d31wxntiwn0x96.cloudfront.ne...s/12221_0.jpeg