My friend has a 89 Cressy. I'd do it for him. I didnt think it would be that much worse than on a Mk3, beyond an oil pan or something, but then again you should be getting a Soarer clip for a Cressida, not a Mk3 clip. Also have heard the fun of wiring...I thought Mk3 already was a nightmare? I cant see how it could be much worse, probably at most maybe 12 wires?