Classic RR and Hawkeye

Here's my first question as a member of the forum; I went half shares with a friend to but a Hawkeye total, it works great because since shelling out I havent had a single electrical problem
Now I've just bought a RR Classic I'm not sure if the Hawkeye is compatible, I havent really checked yet as my mate has still got it, but has anyone used the Hawkeye on a Classic? It's a 1991 (J) Vogue SE 3.9 petrol.

I would very much doubt it is compatible I am afraid!

That's a bit of a gutter, still, what could possibly go wrong anyway?

Pre OBD i doubt you could plug the thing in!!