My Tach Is Off By 800rpm Or So... - NoPistons -Mazda Rx7 & Rx8 Rotary Forum

2nd Generation Specific 1986-1992 Discussion

My Tach Is Off By 800rpm Or So...


Old 03-29-2004, 10:39 PM
Thread Starter
Join Date: Nov 2003
Posts: 53
Thumbs up

My tach is off by 800rpm or so when compared to tach reading from Microtech. Is there any way to fix this? Do I have to swap the gauge cluster out or something? If there is no fix, would installing an aftermarket tach solve the problem? Thanks in advance...
Rookie84 is offline  
Reply With Quote
Old 03-29-2004, 10:49 PM
Senior Member
Join Date: Dec 2002
Location: VA
Posts: 389

yeah have a similar problems with my fd....the oem tach reads about 300 rpms lower than the pfc....whats the deal?
TURBOX2 is offline  
Reply With Quote
Old 03-29-2004, 11:43 PM
Senior Member
Join Date: Oct 2002
Posts: 1,019

thats the reason to go to an aftermarket tach, most factory tachs are not accurate and they lag behind the actual RPM. The inaccuracy increases the higher you rev too.
djgiantrobot is offline  
Reply With Quote
Old 03-30-2004, 12:22 AM
Senior Member
Join Date: Jun 2003
Location: Culpeper, VA
Posts: 572

Gravity also has an affect on the gauges also. Mine is accurate untill it gets a little past 4000, then it just starts to fall. After 100K miles, things start to wear out and get loose. It just happens.
roadkill669 is offline  
Reply With Quote
Related Topics
Thread Starter
Last Post
2nd Generation Specific
07-25-2011 12:43 PM
2nd Generation Specific
10-31-2003 12:28 PM
3rd Generation Specific
06-29-2003 01:51 PM
2nd Generation Specific
07-21-2002 03:38 PM
Insert BS here
01-07-2002 10:25 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Search this Thread
Quick Reply: My Tach Is Off By 800rpm Or So...

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.