GMPP Bulkhead connection for gauges - Team Camaro Tech
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post #1 of 25 (permalink) Old Dec 3rd, 17, 02:04 PM Thread Starter
DT
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GMPP Bulkhead connection for gauges

Did you guys use the GMPP bulkhead connection for your gauges ?? Oil pressure, temp, tach etc ?? I think some guys added another coolant temp sender in the head for the temp gauge. Thx

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post #2 of 25 (permalink) Old Dec 3rd, 17, 02:59 PM
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Re: GMPP Bulkhead connection for gauges

It depends on what Gauges you are using whether it will work or not
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post #3 of 25 (permalink) Old Dec 3rd, 17, 03:21 PM
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Re: GMPP Bulkhead connection for gauges

Generally speaking the oil and temperature signals are not useable with aftermarket gauges. Tach is useable with a pull-up resistor and the speed is useable depending on your speedo selection.

I like to use VHX gauges with a BIM to get the gauge info off the bus. It is so clean....

Don

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post #4 of 25 (permalink) Old Dec 3rd, 17, 03:38 PM Thread Starter
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I'm using New Vintage USA gauges. I guess I will have to add another temp sensor in the head and an oil sending unit. Hmmm

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #5 of 25 (permalink) Old Dec 3rd, 17, 03:45 PM
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Re: GMPP Bulkhead connection for gauges

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Originally Posted by DT View Post
I'm using New Vintage USA gauges. I guess I will have to add another temp sensor in the head and an oil sending unit. Hmmm
You can remove the factory oil pressure sender because the ECM does not use it.

Don

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1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
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post #6 of 25 (permalink) Old Dec 3rd, 17, 03:53 PM
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Re: GMPP Bulkhead connection for gauges

We could not get everything thing to work with the BIM module of a couple VHX installations

Chris 130fe also could not get BIM to work everything either.

This was with the GMPP harness We did discover that guys with PCM worked ok with the BIM.
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post #7 of 25 (permalink) Old Dec 3rd, 17, 03:58 PM
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Quote:
Originally Posted by dhutton View Post
You can remove the factory oil pressure sender because the ECM does not use it.

Don
Yep. Replace the OEM senders for OP and Temp with the senders that come with your gauges. Tach can come off bulkhead connector and may need a step up resistor. You can also pull VSS of the connector for your speedo if it electronic. If cable driven your TKO600 has a cable connection if T56 youíll need VSS

Also hook up the VSS to the tranny. LS3 with GMPP will not run unless VSS is connected.
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post #8 of 25 (permalink) Old Dec 3rd, 17, 04:00 PM Thread Starter
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Thanks guys, I think it's easy enough to just install another temp sender in the head and an oil sending unit. The additional temp sender installs in the pass side head correct? Also the GM oil sending unit is small and narrow compared to the oil sending unit that came with the gauges, I hope I can get this thing installed? I guess just wire tie the harness EOP plug than??

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Last edited by DT; Dec 3rd, 17 at 04:12 PM.
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post #9 of 25 (permalink) Old Dec 3rd, 17, 04:25 PM
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Re: GMPP Bulkhead connection for gauges

The ECU doesn't need a temp sender? I would leave the oil sender in place. I used the check engine light output. I would think the oil sender missing would fire that, maybe not...

Here's what I did with NVU gauges, I'll never buy them again BTW.

- Temp - added sender to pass side head, towards rear.
- Oil - I tapped threads into the cover right above the oil filter. The little block off plate with two bolts.
- Tach - used the harness and used step up resistor.
- MPH - took signal from harness and calibrated a measured mile.

LS3 480hp w/ 4th gen T56.

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post #10 of 25 (permalink) Old Dec 3rd, 17, 04:37 PM
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Re: GMPP Bulkhead connection for gauges

Quote:
Originally Posted by 69L48Z27 View Post
The ECU doesn't need a temp sender? I would leave the oil sender in place. I used the check engine light output. I would think the oil sender missing would fire that, maybe not...

Here's what I did with NVU gauges, I'll never buy them again BTW.

- Temp - added sender to pass side head, towards rear.
- Oil - I tapped threads into the cover right above the oil filter. The little block off plate with two bolts.
- Tach - used the harness and used step up resistor.
- MPH - took signal from harness and calibrated a measured mile.

LS3 480hp w/ 4th gen T56.
ECM needs a temp sender as far as I know, especially if you are using it for fan control. I would add a second one and leave the factory one connected.

Oil temperature sender is not needed and will not trigger the CEL if removed. Done it several times...

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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post #11 of 25 (permalink) Old Dec 3rd, 17, 04:40 PM
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Re: GMPP Bulkhead connection for gauges

Quote:
Originally Posted by Vega$69 View Post
We could not get everything thing to work with the BIM module of a couple VHX installations

Chris 130fe also could not get BIM to work everything either.

This was with the GMPP harness We did discover that guys with PCM worked ok with the BIM.
I have done two installs with the GMPP harness and BIM and both worked for all gauges. Even got the intake air temperature on the display.

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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post #12 of 25 (permalink) Old Dec 3rd, 17, 04:42 PM
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Re: GMPP Bulkhead connection for gauges

Itís a pull-up resistor, not a step up resistor. It pulls the open drain tach signal to the positive rail, hence the name.

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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post #13 of 25 (permalink) Old Dec 3rd, 17, 04:59 PM Thread Starter
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Re: GMPP Bulkhead connection for gauges

Quote:
Originally Posted by 69L48Z27 View Post
The ECU doesn't need a temp sender? I would leave the oil sender in place. I used the check engine light output. I would think the oil sender missing would fire that, maybe not...

Here's what I did with NVU gauges, I'll never buy them again BTW.

- Temp - added sender to pass side head, towards rear.
- Oil - I tapped threads into the cover right above the oil filter. The little block off plate with two bolts.
- Tach - used the harness and used step up resistor.
- MPH - took signal from harness and calibrated a measured mile.

LS3 480hp w/ 4th gen T56.
You don't like the NVU gauges ? I will add an additional temp sender in the head, NBD really. The oil sending unit may be a PITA though. You used the check engine light output for what exactly ?? Thanks!

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #14 of 25 (permalink) Old Dec 3rd, 17, 05:05 PM
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Re: GMPP Bulkhead connection for gauges

Quote:
Originally Posted by DT View Post
You don't like the NVU gauges ? I will add an additional temp sender in the head, NBD really. The oil sending unit may be a PITA though. You used the check engine light output for what exactly ?? Thanks!
Sometimes you need a 45 degree elbow to get the oil sender to clear.

CEL will tell you if your ECM has thrown a code. You should install one and get yourself a cheap code reader just in case...

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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post #15 of 25 (permalink) Old Dec 3rd, 17, 05:11 PM
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Quote:
Originally Posted by dhutton View Post
Itís a pull-up resistor, not a step up resistor. It pulls the open drain tach signal to the positive rail, hence the name.

Don
I stand corrected. yes it basically boosts the tach wave signal (laymanís def)
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