I replaced this on the Vitesse a few years ago, as was looking old and brittle. The original was maybe around a metre in length? and a fairly straightish run from the block to gauge. The only one I found available at a reasonable price was from Moss, I think it was 1.8 M long and is hence circularly, curled around a few times before going through the bulkhead to the gauge.
I never made a note of when I replaced it and never linked it ("doh") though may have been around the same time I noticed my oil pressure dropped from around 65 at 2000rpm, to 50 at running temp and idle, about 25, to 18.
I assume?, the longer the hose, the less pressure?, though no idea if it makes a difference in this arrangement?
This was a good few thousand miles ago and still ok, and hasn't got worse, so not too bothered.
Intrigued if it could be related ?, please.
Thanks