single wire water temp gauge
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,167
From: Dyer, IN
I would suspect that most aftermarket gauges operate on 12 volts, while the C5 ECT is 5 volts. Additionally, you cannot tap into the existing circuit, as that would affect the resistance.
Tech Contributor
Joined: May 2008
Posts: 3,100
Likes: 17
From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
I don't think the +5 volt reference signal used would be compatible with an aftermarket temperature gauge, and it might cause damage to the PCM.
You could probably drill and tap the thermostat housing, to accept your aftermarket sensor, and then wire it as a stand-alone device.
You could probably drill and tap the thermostat housing, to accept your aftermarket sensor, and then wire it as a stand-alone device.
Tech Contributor
Joined: May 2008
Posts: 3,100
Likes: 17
From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
It looks like lucky was already typing, while I was looking the circuit up in the shop manuals.
Seems like we both agree that it's a bad idea to tap into an existing +5 volt circuit.
Seems like we both agree that it's a bad idea to tap into an existing +5 volt circuit.
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,167
From: Dyer, IN
I don't think the +5 volt reference signal used would be compatible with an aftermarket temperature gauge, and it might cause damage to the PCM.
You could probably drill and tap the thermostat housing, to accept your aftermarket sensor, and then wire it as a stand-alone device.
You could probably drill and tap the thermostat housing, to accept your aftermarket sensor, and then wire it as a stand-alone device.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
If you want an aftermarket temp guage, why not just install one on the PASSENGER HEAD in the EXACT same hole that the C5 temp sensor is in? Theres a PLUG in that hole! It's at the rear location on that head on that side of the engine. 
BC
BC
73, c3, corvette, gauge, installation, quicksilver, share, single, stock, temp, temperature, temperture, water, wire, wiring
