Isspro pyrometer question

[Justin C.]

I've got an old Isspro pyrometer, I believe it's this one: ISSPRO Product Categories
It rattles and is impossible to read at night, so I'd like to upgrade to a new enhanced visibility, probably this one: ISSPRO Product Categories
Does anyone know if my existing wires will hook up to the new pyrometer, or will I have to get a new install kit to use also? Thanks,

Justin

[Patrick Feeley]

You might want to PM member MPliska to be sure (unless he chimes in) since he works for them. Cheers!

[MJPliska]

The thermocouples are "generic" except for the connectors on the ends and the mounting threads (we offer both 1/4" NPT and 1/8" NPT). In other words, you can re-use the thermocouple and leadwire that you already have. You will need to add wiring for power and ground, since the old style you have did not require it.

Rather than the EV series, I would recommend the new EV² series. An equivalent gauge would be R17021, although the R16021 with the white pointer is a perfect match for your factory dash: http://www.isspro.com/images/ev2/sma...rge/R16021.gif

We don't sell EV² directly from the factory, but there are a number of stocking distributors:
http://www.isspro.com/EV2_find_distributors.php

The standard EV² pyro price is higher, but that is because it includes the thermocouple and leadwire. You can special order the gauge with a "G" suffix to get it as the gauge alone (e.g., R16021G).

There are a few reasons to recommend EV² over EV:
1) The EV gauge requires an amplifier box, which you have to find space to mount.
2) The EV² gauges come with LED backlighting (never replace a bulb again). It also draws much less current.
3) The EV² pyrometers are temperature compensated. Conventional pyrometers are really just measuring the difference in temperature between the probe tip and the end of the leadwire assembly (typically at the back of the gauge). The industry standard is to calibrate the gauge reading on the assumption that it is at 70°F. If the gauge head is colder, you will show a higher pyro temperature than actual, and vice versa. A dark colored interior of a truck can get to over 170° on a hot day, which results in your pyro reading 100° low during the conditions when you are likely to be running the hottest.

Regards,
Michael Pliska

[Justin C.]

Thanks Michael, that helps a lot. I've got a few questions on what you said below though.

Originally Posted by MJPliska

You will need to add wiring for power and ground, since the old style you have did not require it.

My existing gauge has two wires going to it which I assumed were power and ground, but may not be. The gauge is lighted and dims with the interior lights. I replaced my old 30 psi boost gauge with an EV 60 psi gauge a few months ago and didn't have to do anything to get it working.

Originally Posted by MJPliska

Rather than the EV series, I would recommend the new EV² series. An equivalent gauge would be R17021, although the R16021 with the white pointer is a perfect match for your factory dash: http://www.isspro.com/images/ev2/sma...rge/R16021.gif

My boost gauge has a red pointer so I would prefer to stick with that, but I didn't see pyrometers available with the red pointer and colored numbers like my existing pyrometer has. Is that available in the EV2?
Also - can the bulb be changed in the new pyrometer? I have converted mine to Green LED's to match my dash, and just want to make sure I
can stick with that.

Sorry for all the questions but thanks for all your help.

Justin

[MJPliska]

Originally Posted by Justin C.

My existing gauge has two wires going to it which I assumed were power and ground, but may not be. The gauge is lighted and dims with the interior lights. I replaced my old 30 psi boost gauge with an EV 60 psi gauge a few months ago and didn't have to do anything to get it working.

The 2 wires you have are likely ground and dimmer, just for running the lights. You can use the same ground, but in addition to the dimmer wire you will need a keyed-ignition source (a wire which supplies battery voltage when the key is on but turns off with the key).

Originally Posted by Justin C.

My boost gauge has a red pointer so I would prefer to stick with that, but I didn't see pyrometers available with the red pointer and colored numbers like my existing pyrometer has. Is that available in the EV2?

Yup, the R17021 is red pointer with color coding for pre-turbo limits.

Originally Posted by Justin C.

Also - can the bulb be changed in the new pyrometer? I have converted mine to Green LED's to match my dash, and just want to make sure I
can stick with that.

Sorry for all the questions but thanks for all your help.

Justin

The LEDs are built in and cannot be changed, but they are already green backlit and a perfect match for your dash lighting. I know the color is perfect, we used my OBS truck for the match!