Picture of the original 15psi Eureka gauge on my 1934 OW1.
My 1935 OW1 and the Endeavour special have this 25psi Eureka gauge. I have seen it on other 1935 models, which leads me to think it was 'right' for 1935 models. I have not come across it mentioned as a model year change , however.
The oil pressure gauges are reproduced, though I think just the 25psi version? Might be a post about it somewhere. There is a a repo of the 15psi dial face on the market, though besides not having the red stripe, there are subtle differences in the patent text and Eureka logo. The silk screening is not as crisp either.
Overall view of the 1934 instrument panel. Oil pressure gauge, light switch, and instrument/inspection lamp are original. The ammeter is a replacement, and I am not sure if it is exactly period correct. But it was close enough and besides what I had on hand.
-Doug