Tacho Signal Help :/

[rb26s13]

hey people having a few problems with wiring again (its almost done)

however.. for some reason we cant get any tacho signal wat so ever.. the pin coming out of the computer appears to be dead

computer is a mines remapped r32 gtr factory computer

anyone got any ideas on wat to do? is there another place to get tacho signal from..

neither the factory s13 dash tacho or the autometer monster will pick up any signal wat so ever..

anyone got any ideas??

[SECURITY]

there is a sensor near your rear diff that sends the rpm and speed signal to your ecu. check if thats connected first.

[rb26s13]

wats the speed sensor got to do with it all??

[RB30-POWER]

unsure if the s13 dash has a built in pullup resistor, if it doesn't you will have to add a pullup resistor to the circuit.

the same thing happens when you put the twin cam engines into r31 skylines and vl commodores etc

the pullup resistor needs to be 10k ohm in value and needs to go across the tacho out terminal on the ecu and a +12v wire on the ecu as well.

on the RB26 ecu they are pins 7 (tacho) pin 49 (+12 from efi relay)

once you do this the monster tacho will work, however the 4cylinder tacho in the dash will probably read wrong as its measuring pulses it expects to see for a 4cylinder engine.

hope that helps...

EDIT: ohh yeah the resistor you will pick up from jaycar or dicksmiths for about 10c!

Edited October 5, 2006 by RB30-POWER

[rb26s13]

ok sweet thanks.. will try that tomorow

[rb26s13]

thanks heaps for that dude.. worked perfectly.. dont understand the concept of how it works tho.. but cheers dude