I was out at the pick a part today and found this. A 1990 Eagle Talon turbo tachometer. I am going to see if we can get it to work with the L67 swaps or any one boosting their Fiero. The Sunbird turbo tachometers are so rare any more, This may be a viable option. I don't have any prints but I was able to decipher the inputs on the back of the gauge.
I was wondering if this Dragon Transducer would drive the boost gauge?
The whole gauge setup can be had on EBay for under 25.00 including shipping.
Any input here would be greatly appreciated. I am just trying to find a decent alternative to the Sunbird Tachometer.
It would be cool if you could figure out how to get that to work, it looks a little better and also the higher RPM gauge would be nice for higher revving engine swaps.
------------------ 86 Fiero GT 4spd - L67 swap: VS cam, GenV Build Progress 98 GTP - Some mods
Given the year it was manufactured and it's Denso, perhaps the same tach modification used to convert the Duke or, Sunbird tach to work with the V6 is all that's necessary. You'll have to remove that cover to reveal the electronics underneath. As for the boost gauge it probably taps into the MAP signal wire. An easy way to test it would be to connect a 1.5 volt battery to it and see if the needle moves. If it runs off a variable 5 volt sensor input it shouldn't be too hard to figure out.
Given the year it was manufactured and it's Denso, perhaps the same tach modification used to convert the Duke or, Sunbird tach to work with the V6 is all that's necessary. You'll have to remove that cover to reveal the electronics underneath. As for the boost gauge it probably taps into the MAP signal wire. An easy way to test it would be to connect a 1.5 volt battery to it and see if the needle moves. If it runs off a variable 5 volt sensor input it shouldn't be too hard to figure out.
The Eagle Talon uses a mass airflow sensor and does not have a MAP sensor. That boost gauge is driven by the ECM which estimates the pressure based on the rpm, mass airflow, ect. I know some people that are using DSM link (a tuning setup with the factory computer) can re-assign that gauge to indicate knock, or many other functions.
Originally posted by Zac88GT: The Eagle Talon uses a mass airflow sensor and does not have a MAP sensor. That boost gauge is driven by the ECM which estimates the pressure based on the rpm, mass airflow, ect. I know some people that are using DSM link (a tuning setup with the factory computer) can re-assign that gauge to indicate knock, or many other functions.
According to the provided link to the DSM forum, it is still a simple voltage operated gauge so it may still work in the same fashion as the Sunbird Tach provided the voltage range is the same.
If a small voltage draws the needle down close to -7 that's a pretty good indication it's as simple as suspected. The Sunbird boost gauge is probably nothing more than a modified battery voltmeter like the one that sits on the Fiero center console scaled for the signal range it operates in instead of 12 volts.
[This message has been edited by Joseph Upson (edited 09-29-2013).]
Didn't follow all of what you did or were doing in the test but a trip to RadioShack to pickup some diodes, resistors and a voltage regulator for a small expense in the calculated ranges needed may still help you accomplish this. If you're only going as high as 10 psi assuming 2psi/volt the 5volt reference is all you'll need, plus whatever is necessary to work out the tach if more than 4 cyl are involved.
it looks like I'll be able to find another denso tach from a 6 cylinder car and swap out the circuit board. so that should take care of the tachometer modification.
as far as the boost gauge It does work as posted in this pic.
Can someone chime in for opinion or guidance?
[This message has been edited by hercimer01 (edited 10-04-2013).]
Does this look right how the multimeter is in the circuit? Or does it need to measure from ground to the MAP signal input? I'm just trying to figure out if a 2 bar MAP sensor will drive this gauge.
[This message has been edited by hercimer01 (edited 10-04-2013).]
Another option is to use an old smart phone as a second gauge display, with Torque and a Bluetooth OBDII ( since this is for a 3800). I did this on my SSR, and it works great. Use Tasker ( app) to automatically turn on the phone when it sees power, turns on torque, displays gauges as set. When power is removed, automatically turns the phone off. I use a higher quality Bluetooth that automatically turns off, to keep from draining the battery (ScanTool 426101 OBDLink MX Bluetooth).
