I've never heard about different speedo's wearing out quicker. I assume they are the same as stock except with more/less teeth. I changed the speedo in my '87 when i went to 3.55's and never had a problem for several years, the gears and the speedo were used when I got them too.
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'89 LX 5spd w/ 65k miles
Ported stock heads, TFS Stage1 cam,
GT-40 intake, 70mm TB, 76mm MAF,
MAC headers, Flowmasters,
3.73 gears, Steeda Tri-AX, Mickey ET Streets,
Vortech V1-SC, 38# injectors, Crane InterceptorII
7.9's @92mph (traction enhancement devices needed)
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