Okay so u all know that my 89 Gta is rotted out pretty bad that I can't fix it an would cost alot so I found a 88 Gta trans am 350 car with a digi dash an 700r4 auto the only problem with the car is minor stuff check engine light is on from emission system an it also the speedo don't work is always stays at 0mph now I'm looking to pick this car up as soon as my 89 is junked an sent to the crusher once the car is home I plan on fixing everything wrong with for the speedo do I have to replace the whole digi dash of could it be something else an for the check engine light I'll have to get the codes an go from there anything else I should looks into Before pickin the car up