Hi
According to Volvo's manufacturing records my P1800S was manufactured ("reported OK") 22 Nov 1963 with Engine number 375, chassis number 8683
It would seem that B18B engines from 1961-1963 were 100hp at 5500 and that from 1964-1966 they were 108hp at 5800 rpm.
My Tacho , which sadly doesn't work
, is a first generation version from observation of the backplate of the instrument however the dial has the markings of the second generation instrument with the red zone starting at 6000rpm however it is different from the second generation pictures I have seen in that the lettering "4 CY Negative earth" is missing. See attached photo's
The tacho looks to me to be made from parts from generation one and two instruments. I'm wondering if my vehicle was manufactured in transition from the 100hp to the 108hp versions.
How can I tell which engine I have?