Hey fellas, just wondering if a VL calais dash cluster would fit & work in a 86 VL executive.

Yes! Do a Search; it's been covered many times. FS

If i was to put tachometer cluster in a 88 vl commodore what would i need to change?

There was a good thread somewhere here, where its covered in detail. Basically, you need to do 2x things besides putting the new one in. - Either swap pin #14 into pin #2 on the back of the plug. (or you can just use a bit of wire to get that #14 signal into #2) - Keep your eye out for an oil pressure sender (NOT oil pressure switch that you would currently have) If you dont sort out the oil press. sender or do the wiring bit, the oil pressure will sit all the way on the right. (mines currently doing this as im waiting to stick my oil press. sender on) and coz im in a good mood tonight... heres the thread... Wiring up an Oil Sender Gauge correctly! http://www.calaisturbo.com.au/showthread.php?t=5854

I didn't have to swap anything around, aside from oil pressure, Everything works no problem

Thanks boys much appreciated.

Thanks fellas!