Rpm tach signal?? were from?!

[Cubantunr]

Ok just got the sr20det in the s13 and the tach rpm doesn't work I know it gets the signal from the ecu but were does the ecu get its signal for rpm???
C.a.s.? Tranny? Any help appreciate, thanks

[Wookie384]

Let me google that for you (http://lmgtfy.com/?q=sr20det+tach+signal)

[Flipnirish]

^^^^^^lol!

[Cubantunr]

Goodluck tried and all I got was shit about wires going from ecu to cluster nothing else.

[racepar1]

Was your car originally a single-cam? If so the cluster is NOT compatible with the tach signals from the DOHC KA's or the SR's...

:picardfp:

[Cubantunr]

Dohc everything ran perfect before the rebuild. Just wondering if it has anything to do with me swapping the Sr tranny with a vg30 one..

[racepar1]

Dohc everything ran perfect before the rebuild. Just wondering if it has anything to do with me swapping the Sr tranny with a vg30 one..

You've probably got a wiring issue with the plug from the engine harness to the underdash harness. Your tranny cannot have any effect on the tach signal. That doesn't even make sense...

[KiLLeR2001]

ECU gets the signal from the CAS, IIRC. But you can't tap into that wire directly, it won't display RPMs correctly.

[intel5811]

Its going to be an issue with wiring at the ecu but you can always use a aftermarket tach with a tach adapter....$20 @ jegs and if you dont want to google that I believe its model #9117...good luck

[Cubantunr]

Alright thanks everyone, ill look it over this week.