My tach is messed up

[[GoaTSLonG]]

My tachometer reads 1000rpms more than it should so at idle it reads 1800rpm and i can rev all the way and not get to my rev limiter, what kind of shop would be able to recalibrate it?

[[GoaTSLonG]]

?

[Gregariousgreg]

Do you have an s13? The I've heard the the s13 tachometers aren't compatible with the SR20det.

[SpeedRacer1]

1989-1990 240SX KA24E SOHC Tachometer's cannot be used with SR's.

1991-1994 240SX KA24DE DOHC Tachometer's can be used with SR's.

1991-1994 Silvia/180SX SR20DE (T) Tachometer's off JDM vehicles can be used and will have the proper redline.

1989-1990 Silvia/180SX CA18DE (T) Tachometers will probably work.

1998 ish 180SX Tachometers with a grey face and orange needles will not work in USDM clusters. They will read the proper RPM, they just do no fit.

[[GoaTSLonG]]

so if i buy a 91-94 HUD cluster the speedometer and tach will work properly with my s13 sr? or would i be better off getting a 91-94 180sx/silvia cluster? or do i just buy the tach and leave the rest of the cluster?

[Gregariousgreg]

1989-1990 240SX KA24E SOHC Tachometer's cannot be used with SR's.

1991-1994 240SX KA24DE DOHC Tachometer's can be used with SR's.

1991-1994 Silvia/180SX SR20DE (T) Tachometer's off JDM vehicles can be used and will have the proper redline.

1989-1990 Silvia/180SX CA18DE (T) Tachometers will probably work.

1998 ish 180SX Tachometers with a grey face and orange needles will not work in USDM clusters. They will read the proper RPM, they just do no fit.

Werd. I forgot it's only the 89-90 s13 :thinker

[SpeedRacer1]

HUD are a subject I know very little about. If you dont currently have one then it wont help you to buy an HUD cluster. If you have HUD on a 1990 then it should work if you got a 1991+ HUD cluster in theory.

[[GoaTSLonG]]

right now i have an 89 coupe with an sr20det and a HUD cluster, the speedometer works and the tach is off by 1000rpms

[martin]

right now i have an 89 coupe with an sr20det and a HUD cluster, the speedometer works and the tach is off by 1000rpms

You need to swap in a 91+ Hud cluster, this will work, that's what I did. Or You need just the tach from a 91+ hud cluster and swap it into your '89 hud cluster, this should work, but I haven't tried it. Or you need a tach from a 91+ regular cluster, and swap it into your '89 hud cluster. This might work, if the tach is the same size, again, I've never tried this.

-Martin.

[ImportIntelligence]

Measure the distance between the 2 and 3K mark on the oem tach, remove the needle rest and then the tach will sit on it's internal stopper. Rotate the needle counter-clockwise the distance measure between the 2-3 on the tach and you should be good to go.

[Drakon]

Nice call on that s13 gregarious. since ANY 240sx from, 89-94 is a s13. sigh. To help answer the question...

The car you have came with a SOHC engine and the SR20DET is a DOHC engine. THe 91-94 240's were all DOHC KA's so you will need the gauge cluster from a 91+ or you can get a big aftermarket Tach if you want. The reason yours is off is its not made to read properly on a DOHC engine.

and for Greg, DOHC means Dual Over Head Cam, SOHC is single over head cam