Allow me to revive this thread about speedometer options for the 94 LT1 in the 79 Malibu.

Does the 1994 Z28 PCM speed signal output deliver a square wave signal? If so i think this 2 1/16” gauge might be a solution for a low budget. Id mount it in a pillar pod. Do you think it will work? The install instructions are also available at the linked page.

https://www.glowshiftdirect.com/10-c...dometer-gauge/