tachometer

[Janitorjim8]

So i've had a Sunpro tach for a while... I'm going to hook it up soon. I think i've lost the directions, any one here installed one and have any tips or procedures.. i know that the white wire splices into the white wire going from the distributor to the firewall... or am i wrong there too lol. By the way its a 90 k5 with a 350

 

[hunterguy86]

Is it HEI? If it is it has a tach port on it where you just plug it in. Then you gotta run a power, power for the light and a ground. Its very easy.

 

[hunterguy86]

Sorry just noticed the year model in your post. Mines carbed but seems like it would still be the same on the dizzy.

 

[Janitorjim8]

hunterguy- where is this tach port, it is hei.

 

[78Suburban]

hunterguy- where is this tach port, it is hei.

On the right side of your distributr is a wire. Close to this wire, it says "tach" and there is a terminal which you can plug into.
You can download the sunpro instructions somewhere, because I did it a few years ago when someone gave me a free sunpro tach.

 

[Janitorjim8]

thank you very much

 

[gmcjimmy90]

it should have an external coil and you need to hook it up on the wire that is coming off of it (the one not hooked up to anything else).

 

[89GMCSuburban]

I thought the white wire is for your lights and the green wire is for the signal....

 

[keifer]

I thought the white wire is for your lights and the green wire is for the signal....

bingo

 

[JEBSR]

On the external HEI you want to hook the green wire on the tach to the white wire on the - side of the coil. Red to ignition on power. White to parking lights. Black to ground.

 

[Janitorjim8]

jebsr how do i tell which side is the negative side of the coil

 

[Janitorjim8]

jebsr how do i tell which side is negative side of the coil?

 

[JEBSR]

On the external coil it is not marked, but it is the white wire. I can get a pic of mine if it would help. Sorry it took so long, been out of town for turkeyday.