HELP W/SPEEDO
 

Hey guys,
I have a 88' GT which has an 85 MPH speedo.
I want to convert to the 140 MPH unit, I think Ford put these in all 5.0's starting in 89'? Anyway I want to install the 140 MPH white face guage kit, but I don't know exactly what parts I need to change to do this. The only guy who knows anything at my local Ford dealer says I need the whole "head unit" from a 140 MPH equiped Stang (he did'nt seem interested in helping me so I did'nt ask much else).I figure I should'nd need to switch out the whole guage cluster?
I have 3.73's in the rear and already have the proper drive gear (or is that driven gear?)
At any rate could some of you Gurus help me out please?
THANKS in advance!!



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88 GT subs,pullies,1 1/2 shorties,F.M.,3.73's,PRO 5.0 shifter,140,000 miles 8.881@78.09
Mcreary drag radials