If you want to refurbish the factory Declo unit; I heard good things about 'Wags Klassic Electronics'
Facebook:
https://www.facebook.com/groups/613613486896043/email: wagsklassics@gmail.com
phone: 402) 677-5182
Joseph Sciarrino / delcomaster84@gmail.com is another good source to repair; he is located in Lindenhurst, NY
Or search "Vintage Delco Repair"
If you want to upgrade, PFF member
Fiero Tom is the man...
Send a PM or the email address for Fiero Tom is: tmorris86@gmx.com
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Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles