Techometer

[zeljko]

Does anyone know or can tell me where on a 87 t type turbo the tachometer is hooked up? Is it an electrical or vacuum My tech lite is on and shows one bar but that's all and i been looking all over under the hood and i cant track it down.

Thanks for any help?

 

[83ttypecooled]

Hi,
The ignition module provides a digital signal to the tach, and I believe it is the white wire that carries it.There is a green tach test connector, one wire, on the driver's side harness, also white.This is from memory, but that's the gist of it.Keep in mind that the wire has to travel through the bulkhead connector, so there is some possibility that could be an issue. The sure way to check it would be to remove the instrument cluster and test at the connector.You need a dvom with duty cycle capability, like any Fluke meter.A graphing multimeter is also good.From experience, I would say the tach is bad.CYA, though, do the test. Good luck!

 

[zeljko]

it stoped working after i washed the engin so i think i might have disconected it when using a hose on it

 

[Ormand]

I don't think there's a tach connection under the hood that would be affected by a car wash hose. The tach wire is part of the bundle that goes to the ignition module, and from there it's in a wiring harness until it gets to the big connector at the firewall. But as 83ttype says, maybe there is a problem with that connector?