94 ex tach issue
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Honda-Tech Member
Joined: Sep 2002
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From: Ks
94 ex tach issue
First off my car is a 94 ex coupe w/a GSR swap, the chassis has close to 215K
The issue I have is in regards to what the tach shows versus what its actually reading. My car has the factory tach, and when I had my S300 was tuned to the engine, it was noted that around mid range RPM, my tach is off by usually 500 rpm or more from mid range until my shift point, which is set at 8200 RPM.
The main issue this is causing would be where the engine is supposedly topping out, the tach reads 7000 RPM, and when Ive had a laptop hooked up to the S300 its clearly showing much more and is needless to say very irritating. Ive swapped the tach assembly from a spare 92-95 ex/si cluster I picked up, but this seemed to make the tach give an even worse reading, compared to what the ecu shows..
My questions are these, do the OE tachs have a history of going out? Is it possible that my tach is out of some kind of calibration, and needs to be adjusted, and if that is the case, what is the process for fixing it? Ive also heard that one could swap the guts from a 94-01 LS tach cluster with my stock guts, and that might manage to fix the issue..
Im unsure what to do on it at this point, and I dont want a hideous monster tach mounted to my dash but I want my tach to at least be close to what the engine is saying its running at..
The issue I have is in regards to what the tach shows versus what its actually reading. My car has the factory tach, and when I had my S300 was tuned to the engine, it was noted that around mid range RPM, my tach is off by usually 500 rpm or more from mid range until my shift point, which is set at 8200 RPM.
The main issue this is causing would be where the engine is supposedly topping out, the tach reads 7000 RPM, and when Ive had a laptop hooked up to the S300 its clearly showing much more and is needless to say very irritating. Ive swapped the tach assembly from a spare 92-95 ex/si cluster I picked up, but this seemed to make the tach give an even worse reading, compared to what the ecu shows..
My questions are these, do the OE tachs have a history of going out? Is it possible that my tach is out of some kind of calibration, and needs to be adjusted, and if that is the case, what is the process for fixing it? Ive also heard that one could swap the guts from a 94-01 LS tach cluster with my stock guts, and that might manage to fix the issue..
Im unsure what to do on it at this point, and I dont want a hideous monster tach mounted to my dash but I want my tach to at least be close to what the engine is saying its running at..
Junior Member
Joined: Jan 2008
Posts: 290
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From: FL
Re: 94 ex tach issue
dude i had the same issue a while back. i had an autometer tach but didnt wanna mount it. the stock gauge is never as accurate is we'd like. so i swapped out the autometer internals and rebuilt the stock gauge from that using the same OE gauge face so nothing is noticeable. but i have it wired directly to the signal feed so its as accurate as i hoped for. thats my story
Junior Member
Joined: Jan 2008
Posts: 290
Likes: 0
From: FL
Re: 94 ex tach issue
no i had to get it to fit in with a lil work but not too much. then remount it properly. then after i closed up the cluster it was a tight fit and everything stayed put. if doing this make sure the gauge is about the same size as the OE one so the reading for the coil and needle stays the same
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