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If you ever get wot stumbling when engine is hot, sometimes the cobra elbows can collapse if they get hot enough. On an ls, this is highly unlikely unless there is something very hot nearby, but just keep it in mind. Buddy of mine nearly lost his mind figuring this out.
Personally I don't know why it wouldn't work. In addition, you may be able to use the old factory one from the original toyota transmission to do similarly if you fabbed a bracket off of the trans pan and some simple linkage.
Need some help from those of you who have used the Dakota Digital sgi-8e for tachometer correction. I tried to get mine working this evening and couldn’t get any tach movement. (Running or in test mode) Box turns on fine and idicates it’s getting signal from the ECM. Maybe I’m hooking to the wrong wire behind the glove box?
Referencing @rockrod pinout sheet for 94s I assume this is the correct wire:
View attachment 1618399
My truck is a 94 also, but referencing my EWD says the wire from the tach is black from the cluster to the igniter so I’m kinda lost. I’ve also tried using the “high volt” option as the instructions say it’s necessary with early Toyota clusters. I referenced @MarkN build thread and he had a pic of his mounted and he didn’t have hooked tothe “high volt” port, so I’m not sure it necessary on 80s.
Anyway, she runs on down the road good, and temp sits right at 187-190, just need to figure out the exhaust. Just had manifolds with 4’ of side exit pipes to test everything.
View attachment 1618422
Thanks
I figured it out. I had no business messing around with wiring schematics last night. Lol
I use these valves with the vac control removed, real simple valve. LSX motors run cooler with this valve or similar installed.
Murray #74781
The lever that is left when the vac is removed is on the bottom of the valve when installed, held in place with a zip tie. Twice a year you cut the zip tie, move the lever, put on another zip tie.
If you like you can complicate it with a switch and a vacuum valve.
So what was the solution?
Sorry, meant to come back and add what I did.
Do you mean 8cyl to 6cyl?
It doesn't, but it does. It is not part of the engine harness and comes into the cab on the drivers side. From the drivers kick panel area it travels up into the dash and there is a splice. from there a wire goes to the tach, the other across the dash, through the connector pictured above on pin 4, and to the "DIAGNOSIS" port/datalink under the hood on the firewall. I tied into the tach circuit there and it works perfectly.
