escort 6 dial tacho - wiring to a ecu??

[eke_zetec_RWD]

hey, they run a inductive loop or something. whats the deal when i want to run from a low level drive?

need help. chur

[barf]

whats a 6 dial tacho? does it trigger from coil -ve? please explain?

many if not most ECUs have a (separate) tacho output signal

[Raizer]

6 dial tacho is the tacho in a mk1 6 gauge dash

[eke_zetec_RWD]

6 dial tacho is the tacho in a mk1 6 gauge dash

yea that,

in factory form the power wire to the ignition coil runs through a loop in the rear of the tacho on its way to the coil.

the pulsing of the current draw and the loop/coil induces a flux capaciator which spins the gauge needle!

nah i dunno how it works but thats how its wired stock. the power wire isnt wired to the tacho it just passes through it.

[KKtrips]

Ring Robinsons Instruments they can change it to suit your needs.. (they did a mates tacho for $25 including freight and a wiring diagram)

(I'll need to check if it was Robinsons but am reasonably sure it was..)

[Seedy Al]

speedo services in Auckland is also possible maybe, however that guy is usually dealing with reconning smith stuff

[barf]

and what sort of tacho-output does your ECU have? distributor-style ignitino system?

[Hemi]

so you are trying to use the ecu tacho output single to run the escort analouge guage? . had that prob with my hardtop so ill be keeping an eye on this thread . i just earthed the ignition coils signal earth through the input into the tacho ... works beaut but is a bit rugged

[eke_zetec_RWD]

link g3 ecu. single coil.

ecu pulses a earth for tacho. low current so wont drive tacho.

dnt want any coil power wires in cabin.

[CXGPWR]

I can make u a device that runs from your ecu tacho out to this box, then from the box to your tacho, works well for me, i did it in the 82

[barf]

let me get this right: the tacho has two connections (from each end of the loop), and in and out so-to-speak that go between coil +ve and switched+12v?

if so - this circuit should do the trick but, no guarantees, i'm just some guy on the Internet. it sounds like the tachometer is a current sensing circuit similar to some old Smith's gauges.

this is a modification of the Megasquirt-style high-level tacho output circuit

http://msextra.com/doc/ms2extra/MS2-Extra_Hardware.htm#tachoout

for the dummy load, use at least a 5W wire-wound resistor (NOT carbon-film type!), start with a higher value and work your way down if there is nothing on the tacho (330,200,100,75,50,35,20 ohms). observe how much heat the load generates (not very scientific I know) you shouldn't have excessive heat.