ok i had just bought a 1991 all orignal white on black vette it has the factory 6 speed in it but the tach dosent work . Yes all the wires are hooked up to the distributor and the rest of the dash works , still has the factory clutch , im kinda lost any help. and its the first year of the 91-96 body style but last year of the l98 and also it has the 250hp 350 torque model im not sure if that helps ... thank you any input would help.

 

I just bought a 1991 and am having the same problem, did you find a solution? If you did, please pass it on,

 

Clean and re-attach wire connections, maybe?
Good place to start, no $ involved!