getting a factory 69 tach work with a ls1?
02-25-2013, 09:55 AM
#1
Staging Lane
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getting a factory 69 tach work with a ls1? I know a aftermarket tack will work set on 4 cyl but the factory 69 camaro tach has no settings.
Is there a way to make it work? tach adaptor or can I rim apart a used aftermarket tack and use the setting switch? or is there another way like something at radio shack I can use?
Is there a way to make it work? tach adaptor or can I rim apart a used aftermarket tack and use the setting switch? or is there another way like something at radio shack I can use?
02-25-2013, 05:21 PM
#4
^^^^ Yep, if you have HPTuners, just set the 'tach resolution' from 6 to 3, that will double the output from 4 cylinder mode to 8. Depending on year of PCM, you may also need a "pull-up resistor" to amplify the tach signal coming out of the PCM. It's just a 680 ohm 1/4 watt resistor placed between the ignition power to the tach and the tach input wire coming from the PCM. You can get the resistor in a pack of 5 at Radio Shack for around a dollar.
02-26-2013, 08:08 AM
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Staging Lane
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Thanks, I will contact bill at BP automotive .
he is doing my harness and re flashing the computer, hopefuly he can do this.
Im tired of buying adaptors and stuff I never thought about before doing this swap.
he is doing my harness and re flashing the computer, hopefuly he can do this.
Im tired of buying adaptors and stuff I never thought about before doing this swap.
02-26-2013, 08:20 AM
#6
Yes I can do this! I have done it for v8 signal tachs and v6 signal tachs! If you have any questions, you have my number. I am very busy but I ALWAYS answer my phone unless im on it when you call, then I will call you right back.
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Standalone LS Swap Harnesses IN STOCK!
LSX, LTX Stand alone swap harnesses. S10 LSX conversion PLUG AND PLAY harnesses, 24x conversion PLUG AND PLAY harnesses. LT1 to LSX PLUG AND PLAY Harnesses.
sales@bp-automotive.com
www.bp-automotive.com
1-888-467-4491
08-06-2013, 01:41 PM
#7
Staging Lane
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I can not belive its been 6 months sine I asked about this and I am still working on getting my tach working. the tach still does not work.
I tested the 69 tach on a old motor and its fine, so I borrowed 2 other tachs to try.
there is no tach signal.
I brought the car to slowhawk another tuner and asked hime to check on it and does not know but it shows the pcm knows there is a tach signal because it displays rpm, he says the harness is probley wired wrong and I would belive it if I did not test straight from the PCM since so many other things were wrong in the harness and re- program/flash!
I tried the resistor and any thing else I could but there is no tach signal at all coming from the pcm where its suppose to.
one of the codes it giving me is a tach signal output circuit..anyone know whats going on here?
I tested the 69 tach on a old motor and its fine, so I borrowed 2 other tachs to try.
there is no tach signal.
I brought the car to slowhawk another tuner and asked hime to check on it and does not know but it shows the pcm knows there is a tach signal because it displays rpm, he says the harness is probley wired wrong and I would belive it if I did not test straight from the PCM since so many other things were wrong in the harness and re- program/flash!
I tried the resistor and any thing else I could but there is no tach signal at all coming from the pcm where its suppose to.
one of the codes it giving me is a tach signal output circuit..anyone know whats going on here?
