Well I have a T-56 in the garage waiting to be put in but I'am not to sure what to do with the speedo problem, I have a cyberdine box but I didn't care much for it on my T-5 install, just wondering if anyone used this box with a MAF equiped car and if you had any luck with it?

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89 T-Top GTA 350 5-speed (soon to be 6-speed)
(Jet hot coated)1 3/4 SLP headers,flowmaster force 2,no cat's,SLP cold air,MSD 6al,march pulleys,ported plenum,air foil,B&M ripper shifter,180 stat,alston SFC,spohn LCA relocation brackets,ES LCA and Panhard bushings,free mods.

0-60 5.2s
Track Time
60' 2.049
E.T. 14.14@96.7MPH (2270 FT)
13.76@99.4MPH corrected

 

I'll try again. ttt

 

From what I could gather, it will work on all 87+ firebirds and 89 or 90+ camaro's.
whichever years incorporated the vss technology. So, if you don't have a speedometer cable going to your dash, it should work fine.
...I hope it does, cause I just ordered one to go with my t56 swap

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My 89 Formula
13.98 @92 mph 2.06 60 ft
1989 Firebird Formula, WS6 Package, ZZ4 Crate engine.
MSD 8.5mm Super wires, SLP 58 mm throttlebody, Edelbrock TES headers, SLP 3" SS exhaust,
Random Tech 3" hi flow cat, K&N filter, 700R4 trans w/ vette 2/4 shift servo, worked valve body, kevlar band,
2200 rpm stall converter, Borg Warner 9 bolt 327 rear (full poly mounts) Hotchiss panhard rod, Lakewood LCA's,
Spohn subframe connectors, custom chip, Walbro hi-flo fuel pump.
Accel stuff: 24 pound injectors, Superram intake, Large tube runners, billet distributor, supercoil.
In the works: 1997 Trans Am T56 Trans swap, Spohn crossmember/torque arm/driveshaft loop

 

I believe one computer wants a 4000ppm signal and the other wants a 2000ppm signal. The dakota box can do either, so it simply a matter of figuring out which one is which. My guess is if the speedo is reading double or half what it should, you got the wrong one.