I think the RM version is better than the Fairey too- My SIII 88 had an overdrive and although I didn't have a tach, I don't think the overdrive gave it more speed by much- but it did make it cruise much more comfortably at speed.
Overdrive is better than none- but if you really want to get more speed out of them using the overdrive, increasing the torque a bit (maybe a stage II cam or some other tweaks) will go a long way.
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2002 Freelander
2000 DII w/CDL
1967 SIIA 109SW
Former Rovers
2004 Modded "S" Disco, R.I.P.
2004 G4 Disco
2002 Modded Freelander
1995 Modded Disco
1994 D-90 #8
1993 NAS D110
1990 Range Rover County
1973 SIII 88
1972 Range Rover 2 door
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