i dont think it will matter, if 1985 c reg pass MOT's then i am sure a 1986 one will,
they only put approx year car was first used on MOT's certificates which will be
1985, i am not sure about the twisting of wires together,
have a look at your V5 as it will state whether its a 85/86 and you will know
whether it originally has indicators or not