brennov8

Hi dudes, i'm from brazil and i have a 94 civic ej1 exs mt d16z6.
My car are have a rpm guage problem, at idle the guage shows 700-800rpm, at 60mph show 2000rpm and the cut-off are on 5900-6000 when its suppose to be 7200 rpm

what can be the problem?

ps: sorry my poor english

ezone

Is that the original and correct engine for that year and model of car?

Is the computer correct for the engine you have?

Did someone replace the engine but not replace the computer with one specifically for the new engine?

brennov8

It's all OEM

The car are the same as brand new, same engine, same ECU nothing has been changed.

ezone

Have these readings changed since the car was new?

If the tachometer has become inaccurate, readings may appear lower than actual?

brennov8

Exactly the readings may appear lower than actual.
I bought the car from a friend of mine and he told me that some time ago the rpm began to show a lower value than the actual.

brennov8

thats my car in the video the first gear cuts at 6000 rpm and 35 mph

ezone

If you want to confirm the tachometer on the dash is not accurate, obtain a different "known good" tachometer (digital, aftermarket gauge, or voltmeter-multimeter with tach function), connect it to the RPM test connector then compare?

brennov8

They engine are running 7200rpm but the tacho shows only 6000. whey i'm driving the rpm increase normal at idle to 2000 rpm after this increases slowly

ezone

The tach gauge in the dash is probably bad, but using another as a test would confirm the inaccuracy.

brennov8

Today I dismounted my cluster and clean it, remount and start the car now its cutting on 6150-6200 rpm, i dont have money to try other guage. Any other optiom?

ezone

Small improvement? Clean it some more?

Save money to
-buy a new gauge
-buy a good used gauge from a auto recycle yard

or ignore the bad gauge, it is not hurting performance nor hurting the rest of the car

??