I recommend getting a user ID and pwd for this Honda site.
They have a sub-forum for each generation of the various Honda cars.
Quite informative, though mostly they're into performance.
Tach and gauge swaps:
://DIY • 92-95 Civic Cluster Swap - from NO tach to TACH (retaining OEM miles) - Honda-Tech
Site FAQ for many projects:
FAQs - Frequently Asked (Tech) Questions - Honda-Tech