Hamps
I'm Awesome
I reached out to a staff member and was informed to try this part of the forums. I will reach out to Howell today and run it past them. Here is the link to the VSS I purchased and I believe this will be the direction to go because it produces the needed pulse signal 2000 PPM.
https://howellefi.com/product/tpi-tbi-vehicle-speed-sensor/
I attached the manual for the VSS look under step 2 for early TBI. That is where it says to install the signal wire to the ECM and my wiring diagram matches what everything is saying.
The only thing I have left to complete my SAS is to fix the speedometer. It is a 1989 2wd 700r4 that I went nuts and turned it into a 4wd 4spd. I purchased a VSS from Howell because it was one that I could find that would provide the needed 2000 Pulse Per Mile.
The purple and yellow twisted pair wires that use a magneto pickup from the factory 2wd 700r4 are still there. Purple is high speed from what I can tell and yellow is low speed. These wires go directly to the cluster and supply signal/pickup from what I can tell and back feed to the ECM through a brown wire with red stripe on A10. The VSS switch I bought from Howell is the 2000 pulse per mile and their instructions state to put the red wire "from the VSS" mounted on the speedo gear in the transfer case directly to the ECM A10 location then the black wire directly to ground. I have tried literally everything I can think of and I can still not get my speedometer to operate. I have not tried twisting the yellow and purple wire together and running the wire to the ECM from the VSS.
The speedometer worked well before and tach read 2400 RPM at 65MPH in drive. With the new combination I will have 35 inch tires and tach should read 2500 RPM at 65 MPH so I do not think there will be an issue with the DRAC once I get it to work. If anyone has any input I could really use the help in getting the speedometer issue sorted. I used page 984 on the manuals offered here https://www.gmt400.com/threads/88-95-service-manuals.43575/
Here is my pile for reference https://www.gmt400.com/threads/pig-pens-89-gmc-2wd-sas-auto-to-sm465.52511/
thanks for any help on this issue.
https://howellefi.com/product/tpi-tbi-vehicle-speed-sensor/
I attached the manual for the VSS look under step 2 for early TBI. That is where it says to install the signal wire to the ECM and my wiring diagram matches what everything is saying.
The only thing I have left to complete my SAS is to fix the speedometer. It is a 1989 2wd 700r4 that I went nuts and turned it into a 4wd 4spd. I purchased a VSS from Howell because it was one that I could find that would provide the needed 2000 Pulse Per Mile.
The purple and yellow twisted pair wires that use a magneto pickup from the factory 2wd 700r4 are still there. Purple is high speed from what I can tell and yellow is low speed. These wires go directly to the cluster and supply signal/pickup from what I can tell and back feed to the ECM through a brown wire with red stripe on A10. The VSS switch I bought from Howell is the 2000 pulse per mile and their instructions state to put the red wire "from the VSS" mounted on the speedo gear in the transfer case directly to the ECM A10 location then the black wire directly to ground. I have tried literally everything I can think of and I can still not get my speedometer to operate. I have not tried twisting the yellow and purple wire together and running the wire to the ECM from the VSS.
The speedometer worked well before and tach read 2400 RPM at 65MPH in drive. With the new combination I will have 35 inch tires and tach should read 2500 RPM at 65 MPH so I do not think there will be an issue with the DRAC once I get it to work. If anyone has any input I could really use the help in getting the speedometer issue sorted. I used page 984 on the manuals offered here https://www.gmt400.com/threads/88-95-service-manuals.43575/
Here is my pile for reference https://www.gmt400.com/threads/pig-pens-89-gmc-2wd-sas-auto-to-sm465.52511/
thanks for any help on this issue.