I have a friend who has one of the after market tachs. I was needing a wiring diagram as to how to hook it up. He has a 96 Accord EX 4 door. Thanks in advance

 

I searched for 60 seconds, here is what I found hope it helps.

https://honda-tech.com/zerothread?id=1115320

 

there are tons of different aftermarket tachometers ... specific model and make would help

http://www.egauges.com/AM_Instr.asp

 

There's a post from FAQ which showed you step by step in how to replace components of the cluster. I replace a tachometer this summer after getting one from ebay. Yes, I took a chance and it worked. Mine is a 96 EX 6cyl 4 doors.

The steps to finally get to the cluster is sort of involved, for me. I had to lay all the pieces on a carpet and then put it back together. It took me half a day.