Hi, I think not. Yes it will move but it will be a factor out. I had similar with my Triumph Stag when I bought it - tacho reading a factor of 2 too low as someone had fitted a 4 pot smiths tacho from an MGB. I fitted the 8 pot and immediately spot on. So, in short, find a four-pot tacho from a Volvo of that era and it should pop right in.
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