Hello, I would like to install a tachometer of a oldsmobile 1966 in my cutlass 1968 with ignition HEI, Can i directly connect the pulse of the tachometer on the point TACH of my Ignition HEI ?


Thank's for your answer.

 

Yes, that's what the TACH terminal is for.

 

Ok thank's Joe,i will try this.

 

Yes, i have try this today ,it's great... it works
but my idle is low -> ~ 400 rpm it's normal doctor ?

 

Sound like it's not cycling correctly

 

You might check your tachometer to see if there is a switch on the back of it. Sometimes tachometers will have a switch which differentiates between 4 cylinder and 8 cylinder. This could cause your tachometer reading to be bad.

 

No, my tachometer comes from a oldsmobile 1966,no switch inside, but was there a tachometer for a 6-cylinder that time?

 

does it seem like the engine is actually idling at 400 rpm?
what is the reading an external tach gives you?

factory tachs aren't usually very accurate, btw.


bill

 

I know you can get tachometers adjusted. If it has never been serviced then maybe 42 years have caused it to read inaccurately.

 

I have to find a 2nd tachometer to compare

i thank's you all guys for your answers , i will back later

 

You can generally rent a tachometer at the local auto parts store. Or at least, you used to be able to get ahold of them.

 

Where did you order your tachometer and is it the cluster tach? The set of 3 that reads your oil, RPM, and volts or water temp? I have seen a few Olds with them below the dash, but I am having trouble finding them. Thanks

 

This is my tach ... he comes of ebay motors

 

What does the needle do when you rev it to 8500 rpm? I thought you put a girdle and aftermarket connecting rods on your engine.

 

you can get the clusters from advanced auto, ebay, amazon, autogage are really good guages yet expensive, auto zone has a cluster set for like 32 bucs for a cluster of sunpro and i found a guy on ebay who makes classic looking housings here is a reference link to him http://cgi.ebay.com/ebaymotors/ws/eB...266025753&rd=1

 

hello , i m back

i tried to connect a new autometer tach and he done ~500 rpm at idle on PARK (with AT)

How should lie idle ideal? 800 rpm at idle?

thank you

 

Is it running smooth?
Leave it where it is.
If it doesn't die when you put it in gear, or at a light it's fine.

 

iirc, the range is 550-650 in drive.


bill

 

The police get their speedo and tach calibration done somewhere . I call them and ask for the local shop .

 

when I start the engine, I must push the accelerator pedal depressed slightly for a few seconds otherwise the engine stalls. engine hot or no. (i don't have a choke)

I shall check by raising a little slowed to 550-650 rpm on drive to see...

thank