91 V8 gauge cluster in a 91 V6?
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From: Pekin, IL
Car: 91 Formula, 79 Trans Am, 72 LeMans
Engine: 305 TPI, 6.6, 350 Pontiac
Transmission: T5, 3 speed, TH350
91 V8 gauge cluster in a 91 V6?
Can this work? My v6 gauges are way off, found a cluster from a v8 car that works. Is this a direct bolt in or does it need wired diffently?
Joined: Aug 1999
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From: RI
Car: 1984 Camaro Berlinetta
Engine: LT1
Transmission: T56 6-speed
Axle/Gears: 4.11 LS1 Rear End
Re: 91 V8 gauge cluster in a 91 V6?
Temp Install the V8 cluster AS-IS and see what works and what doesn't. ( Just push it onto the cluster plugs and turn the key ) This is a good time to replace any dead back-lighting or "tell-tale" light bulbs like BRAKE or SECURITY for example. Once you know the gauges and backlighting and tell-tale lights work OK in the replacement (V8) cluster, pull your V6 Tachometer and Tachometer chip from your original Cluster and install them into the replacement. Done.
If your Tach was reading correctly than it will read correctly in the replacement cluster. If the Tach was reading wrong than the tach will remain reading wrong.
At this point you would have a V8 cluster with the original V6 tach and Chip. If the tach is still not working right then you could TRY to install the V8 Tachometer chip ( NOT the Tach GAUGE ) to see if that corrects the tach reading. I do not know if this will work - but it's worth a shot !
If your Tach was reading correctly than it will read correctly in the replacement cluster. If the Tach was reading wrong than the tach will remain reading wrong.
At this point you would have a V8 cluster with the original V6 tach and Chip. If the tach is still not working right then you could TRY to install the V8 Tachometer chip ( NOT the Tach GAUGE ) to see if that corrects the tach reading. I do not know if this will work - but it's worth a shot !
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From: Hokesbluff, Al
Car: iroc z
Re: 91 V8 gauge cluster in a 91 V6?
ive done a few tach fixes lately and changing the chip really didnt change nothing. changing the tach itself would make a change. i really havent figured out why yet as im still learning them. i do know the pulse signals are different from a v6 to v8. not trying to mislead anybody anything is worth a shot, especially when one of them isnt working anyway.
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From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Calibration Situation
Pulse signals are not “different” V6 vs. V8, there are merely less of them per revolution.
3 per rev for a V6, 4 per rev for a V8.
Tachs can be calibrated thusly:
In the dash there is a circuit that moves the pointer.
It’s contained on a small plug-in PCB or integrated in the main board.
On the PCB you’ll see a resistor chip.
Desolder pins 4 & 10.
Use a 500K potentiometer.
Solder it across traces 4 & 10.
Move the potentiometer to half way.
Start the engine and compare the tach reading with a test equipment quality tach.
Dial it in, unsolder one side of the potentiometer, measure it and buy the matching resistor.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
If People Drove Any Slower They’d Be Going Backwards
When you see fog lights on in good weather beware. Low performance driver ahead.
How bout those nitwits too scared to drive without headlights in the daytime, and the nitwits that need headlights for a little rain
.
.
3 per rev for a V6, 4 per rev for a V8.
Tachs can be calibrated thusly:
In the dash there is a circuit that moves the pointer.
It’s contained on a small plug-in PCB or integrated in the main board.
On the PCB you’ll see a resistor chip.
Desolder pins 4 & 10.
Use a 500K potentiometer.
Solder it across traces 4 & 10.
Move the potentiometer to half way.
Start the engine and compare the tach reading with a test equipment quality tach.
Dial it in, unsolder one side of the potentiometer, measure it and buy the matching resistor.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
If People Drove Any Slower They’d Be Going BackwardsWhen you see fog lights on in good weather beware. Low performance driver ahead.
How bout those nitwits too scared to drive without headlights in the daytime, and the nitwits that need headlights for a little rain
.
.
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