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-   -   Need Speedo Advice (http://www.hotrodders.com/forum/need-speedo-advice-226695.html)

Chevyman87 11-30-2012 10:35 PM

Need Speedo Advice
 
Ok so after much debate I finally swapped the trans in my '88 C1500 and got me a fresh TH350. I had a 700r4 in it at first tho. So now, I have a question. I've installed a speedo gear and housing with an electrical sender that's got 3 wires on the harness (black/white/red), but the harness on my OE speedo has only 2 wires (brown/yellow). So I was wondering, would I be able to cut the connector on the OE harness and just hook up the 2 wires to the 3 wire harness on the electric sender? If so, which wires would hook up to what? Thanks in advance for your help!

123pugsy 12-01-2012 03:39 AM

Who makes the 3 wire sender you have?

Chevyman87 12-01-2012 01:02 PM

I got it from summit racing its part #sum-800600gm

123pugsy 12-01-2012 03:11 PM

Cut the harness, no big deal. Cut it back about 6" in case you want to hook it up again.

I would guess yellow to white, purple to red and ground the black wire. :drunk:

cdminter59 12-02-2012 10:23 AM

Need Speedo Advice
 
Most aftermarket speed sensors will not work with factory speedometers. The speedometer sensor you have now is a 16 pulse sensor. I believe the factory speedometer sensor is a 8 pulse. What happened to the sensor from your 700R transmission? Did it have the sensor screwed to the speedometer gear housing?

123pugsy 12-02-2012 12:35 PM

Quote:

Originally Posted by cdminter59 (Post 1618214)
Most aftermarket speed sensors will not work with factory speedometers. The speedometer sensor you have now is a 16 pulse sensor. I believe the factory speedometer sensor is a 8 pulse. What happened to the sensor from your 700R transmission? Did it have the sensor screwed to the speedometer gear housing?

Thanks, I forgot about the pulse business.

Check out this site for vss's driven by the speedo gear:

V-8 Vehicle Speed Sensors (VSS), Speedometers, V8 Conversions, Stealth Conversions

Chevyman87 12-02-2012 11:19 PM

Sensor on the 700r4 would have not worked as it was screwed to the speedometer gear housing. Also the speedometer gear housing was much bigger in diameter versus the bullet style speedo gear housing in the TH350. Someone recommended a unit made by Dakota digital (DAK-SGI5) but it was a bit confusing to figure out how to make it work. The only reason I have the part I do now is because I wanted to cover the speedometer gear housing hole with something more reliable than the factory plastic plug they installed in it. Does anyone have any experience with the Dakota digital part?


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