SciFi and Fantasy Book Club discussion

M (this is you)
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Hi,
I am looking for a SciFi story I've been reading in the 80s (if I remember correctly the story had an 80s rather than 70s feel to it but it might be a bit older).
The main character believe himself to be a normal person (I think I remember a business man) who suddenly when under distress (I think he got attacked or so) turned out to be an android / cyborg.
The story then turned into an action-heavy thriller.
I most vividly remember a scene where the character's android / cyborg capabilities kick in, i.e. where he suddenly sees stragic and targeting grids augmenting his view.
I always thought that this was a book by Christopher Priest, but looking through his books I couldn't find anything that resembled this. Though I might have missed the book - or maybe I am making the link to Priest totally up.

Would be very grateful for any hints or tips
Thanks so much
marcel