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polopharm
09-20-2015, 01:31 PM
So I am back from California, and am excited to drive the Gtp again.
Installed the new engine and a few go fast parts at the same time.

I picked up a 160 mph speedo while at rossion a while back. My speedometer has never worked. It just jumps around. I hooked up the ' new" one and same thing.

What speedo cable do these cars use ?

ATaylorRacing
09-20-2015, 07:34 PM
Not sure what cable they use, but lots of graphite grease seems to fix most of the jumping around.

player1up
09-21-2015, 09:38 AM
While there is a short cable that runs from the trans to the pickup. The gauge is electric, it's not a grease issue. It has to do with old capacitors inside the speedo. VDO speedos are notorious for it. Same with the NOS speedo...it's just as old.

Symptoms are:
Jumps around, reads double sometimes, symptoms can get better for a while when the gauge has had power applied to it, but usually ends up dead the longer it's run.

I know of at least 5 dead speedos in these cars

Johnny
09-22-2015, 09:58 AM
My was bad also. Bought a new VDO one. Also got the GPS unit, so mine now doesn't work the first mile then the gps finds the satellite and works. Works good now. But still need to find out why my cruz is not working.

MPI_duster
09-22-2015, 10:31 AM
My was bad also. Bought a new VDO one. Also got the GPS unit, so mine now doesn't work the first mile then the gps finds the satellite and works. Works good now. But still need to find out why my cruz is not working.

I'm going the same route with the GPS unit. Think I'm going to put my on constant hot though, since work is only 2.5 miles away. lol

polopharm
10-16-2015, 01:07 PM
Explain the gps unit please ? Is that running thru the vdo speedo or a separate gauge or what ?

Johnny
10-16-2015, 02:14 PM
I am sure their web site tells all about it.....
Speedo, plus sensor and thats it (plus electric).

Johnny
10-16-2015, 02:45 PM
VDO 340-786 for the GPS speed sender

http://www.jegs.com/webapp/wcs/stores/servlet/KeywordSearchCmd?storeId=10001&catalogId=10002&langId=-1&Ntk=all&Jnar=0&itemPerPage=60&Ne=1%2B2%2B3%2B13%2B1147708&searchTerm=vdo+gps

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This VDO GPS speed Sender is compatible with all current and previous VDO electronic speedometers and includes a small form-factor which allows mounting in more locations, including the back of the speedometer. Easy installation with no buttons or switches to activate.
FeaturesBackward compatible with all electronic speedometers
Signal loss protection circuit continues to transmit last know speed until signal regained
LED activity status indicator
Water-proof design (IP 67)
Single Housing Design with no external Antennae
Output Signal: 0-10V Square Wave @ 200,000 Pulses Per Mile
Meets Electromagnetic Certification EMC 2004/104/EC

polopharm
10-16-2015, 05:11 PM
That's awesome. I assume it allows the odometer to function too ?

Johnny
10-16-2015, 06:12 PM
Sure does.

polopharm
10-16-2015, 09:10 PM
I just ordered mine. Hopefully will have a functional car to put it in soon.