tach work in drive but not park.

[mk3-4-me]

So my tach all of a sudden stopped workin again a couple days ago.

Today it started working again like normal. I took it for a drive and when i put it in park my tach just went down to 0. It jumps a little but goes to 0.

But when i put it back into reverse or drive, it works again.
Maybe is a bad connection somewhere, but why would it work fine when i shift into D?

any ideas on this?

 

[bioskyline]

thats really weird. the tach gets its signal from the ignighter so dont matter if its moving or not. id suspect a bad wire from ignigter to dash that works under load. iirc its the solid green wire, ill get pics in the am when its light out of what wire.

 

[mk3-4-me]

Ok ya it's gotta be a connection

 

[mk3-4-me]

so now it just went to not workin again.. that sucks.. lol sometimes it comes on.. idk what it is. i wiggled all the connectors by the ignitor, my cps, any wire and nothin...

 

[bioskyline]

maybe the tach in the cluster is bad? or bad wire behind the cluster?

 

[mk3-4-me]

Ya that could be... I forgot I took the dashbout before, and I prolly wiggled a wire loose or somethin...

 

[mkiiichip]

Unless you find a way to read a RPM signal, diagnosis is just guesswork.
Most automotive multi meters can read RPM signals. Got one?

 

[D.J.T.]

If wires are good & you suspect the tachometer is bad all together i have a working extra tachometer. It does not have the original face or a face though. I bought another cluster, well all the components because my cluster didn't have the original faces & the glow gauges didn't work so thats why i have extra gauges lying around. It came from an 87 Turbo. Just letting you know. Hopefully that isn't your case though.

 

[mk3-4-me]

I think the tach is fine cause when it comes on, it works normal... I have a fluke multi meter.. Idk if it has an rpm signal thing or not though...

 

[mkiiichip]

Take a picture of the Fluke and post it.