73-87 Tach/fuel gauge combo

[Tilt]

I've been looking for a tach in the 7-8K rmp range and found these. I like the idea of keeping the stock look. Has anyone used one of these tach/fuel gauges in their swap? Does the LS pcm put out the correct singnal?

http://gmsports.com/content/new-tach...and-gmc-trucks

[Rich84]

Originally Posted by Tilt

I've been looking for a tach in the 7-8K rmp range and found these. I like the idea of keeping the stock look. Has anyone used one of these tach/fuel gauges in their swap? Does the LS pcm put out the correct singnal?

http://gmsports.com/content/new-tach...and-gmc-trucks

I hope so..I bought one a couple years ago, now I'm getting ready for an LQ4 swap.

[ls1nova71]

The tach will work, but you will need to change the tach resolution in the tune from 6 to 3 to double the output since LS engines put out a 4cyl tach signal.

[Tilt]

Thanks, I may pick one up then.

[homemade87]

I have been using one for a while now . Works perfect . There is a couple threads on the install as well from a while back. Do a search and you should be able to find them . If I remember correctly you have to put a up resister on the tack wire to get it to power the tack . The pcm does not have enough power to drive the tack on it own . You will find this info in the the past threads as well . Ls1nova is correct . You will have to change the tach signal as well in the pcm .

Heres a picture of mine .

[MalibuSSwagon]

search the 73-87 boards, lot of threads regarding the GM Sports tach and also factory tachs.

[solidaxel]

Originally Posted by Rich84

I hope so..I bought one a couple years ago, now I'm getting ready for an LQ4 swap.

What plans do you have for your speedometer or are using a 700R

[Rich84]

Originally Posted by solidaxel

What plans do you have for your speedometer or are using a 700R

I would like to put the Suburban speedo in my cluster if possible..Since I already dropped the $200 on the tach. I'm going with the 4l80e.