Although I do hate to say it, the film - as it stands today - must be a very watered-down version of the original script.
The gay angle hardly exsits - although in the scene in which they first meet and which is shot from the point of view of Jan Michael Vincent's fabulous **** - Charles Bronson's interested stare can not be mistaken.
There's also a later scene in which they are talking and which is shot from the point of view of Jan Michael Vincent's inviting crotch.
I would say that Bronson is definitely more interested in that he suddenly feels that he needs an assistant - when it is perfectly clear, on the strength of the first scene, that he can work very well on his own - and when he defends his choice to the man who provides him with his assignments.
When he discovers that he is going to be Jan Michael Vincent's "hit", he still keeps him around.
And, for awhile, Jan Michael Vincent seems to have saved him from that set-up on the yacht in Italy.
And Charles Bronson does drink that fatal glass of wine - immediately sensing that it is almost certainly poisoned.
Charles Bronson underplays it all - but the man is in love!
Jan Michael Vincent never was - he was just out to kill the man who had killed his father.
He used Charles Bronson's attraction to bring him down.
But Charles Bronson - with his super-expertise as "a mechanic" - brings Jan Michael Vincent down - and he does it from the grave!
I would have liked a more explicit version of the material, though - one that had involved them in a love affair.
Therefore, his betrayal of Charles Bronson would have cut so much more deeply.