hi im new to the site and have 2 probs with my 1990 tt fairlady the 1st is that it sometimes stalls for no reason and the 2nd is that i took car to hpc in horsham to fit a delimiter\mph converter and they are saying they cant fit it as i have nismo 300kph clocks in it is this true or not and if true will i need 2 buy 180kph clocks or uk clocks and will i still have to fit the delimiter to the uk clocks