Diesel tacho with Commo V6

[Scott]

Does anyone know what's involved in hooking up the tacho in a 1990 Diesel Hilux with a commodore v6 engine?

I see Marks sell a kit for $95 to hook up the tacho, but was just wondering if it was a simple procedure not requiring the Marks kit.

[toyrex]

Yes take your tacho out and have it recalibrated

[dumbdunce]

that's not really helpful is it?

you need to build a circuit that will change the tach signal from the V6 ecu to a signal the lux tach will understand. the diesel lux motor uses a hall effect sensor on the fuel pump with a toothed wheel, so you need to:

use a CRO to compare the signal from a lux tach sensor and the signal from the commodore ECU (need frequency, amplitude, and wave shape info), then build yourself a circuit to change the commodore signal to be like the lux signal. if you have the tools (CRO, signal generator, soldering iron etc) and the electronics skills, it wouldn't be hard to do, probably $10 in components and a couple of hours engineering. I think the $95 is pretty good value but there is some cook geeky cred in doing it yourself.

maybe you'll get lucky and someone else here has done it or has a Marks unit that you can reverse engineer.

[killalux]

when i looked at doin the holden 5 litre conversion marks only did a kit to a petrol hilux tacho not a diesel.

[toyrex]

It cost me $50 to have my tacho recalibrated and I dont have bits hanging every where to make it work

[Scott]

Thanks for the help guys. I didn't have a clue how the tachos worked, so at least I have some idea now from dumbdances explanation.

I don't think I'll bother building anything, so I'll either get the Marks kit or find someone who can recalibrate it.

Killalux, Marks definately do a kit for V6 to diesel tacho, not sure about v8 to diesel tacho.