89GT Temp Gauge

QuantumMotorsports · 06-07-2001, 12:29 AM

You can fix that prob pretty easy. Do you have a digital multi meter or an ohm meter? You need to find out the resistance of the sending unit when it is at full and empty. Mine is approximately 100 ohms at empty and 10 at full. To change the range, just find either a resistor or potentiometer (variable resistor) and put it in series with the sending unit (splice it into the wire coming from the sending unit to the gauge) This will raise the resistance of the total circuit and bring the gauge down. If your range is similar to mine (mine is from an 88 turbo coupe thunderbird) you should probably either get a 4.7 ohm resistor (it's a common size at radio shack) or a potentiometer around that range would be better. You can usually find a 10 ohm "pot" at radio shack. If you need help on exactly how to hook it up, just post again and I'll draw you a diagram. Good luck. You might be able to fix the water temp sensor with an ohm meter too. But if you don't mind having an aftermarket gauge, go for that.

------------------
Michael Black
Quantum Motorsports
Norman, Oklahoma

1988 Merc Cougar 5.0 HO, Ported and Polished E7TEs, 2.25" offroad H pipe w/ 2 chamber flowmasters, T5 tranny
New E/T!!!
14.626 @ 94.94mph, 2.194 60' time, a little better than last time. Keep in mind this thang is heavy (3590lbs) Finally 14s!!!!

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06-07-2001, 12:29 AM	#1
QuantumMotorsports Registered Member Join Date: Jul 2000 Location: Norman, Oklahoma, USA Posts: 597	You can fix that prob pretty easy. Do you have a digital multi meter or an ohm meter? You need to find out the resistance of the sending unit when it is at full and empty. Mine is approximately 100 ohms at empty and 10 at full. To change the range, just find either a resistor or potentiometer (variable resistor) and put it in series with the sending unit (splice it into the wire coming from the sending unit to the gauge) This will raise the resistance of the total circuit and bring the gauge down. If your range is similar to mine (mine is from an 88 turbo coupe thunderbird) you should probably either get a 4.7 ohm resistor (it's a common size at radio shack) or a potentiometer around that range would be better. You can usually find a 10 ohm "pot" at radio shack. If you need help on exactly how to hook it up, just post again and I'll draw you a diagram. Good luck. You might be able to fix the water temp sensor with an ohm meter too. But if you don't mind having an aftermarket gauge, go for that. ------------------ Michael Black Quantum Motorsports Norman, Oklahoma 1988 Merc Cougar 5.0 HO, Ported and Polished E7TEs, 2.25" offroad H pipe w/ 2 chamber flowmasters, T5 tranny New E/T!!! 14.626 @ 94.94mph, 2.194 60' time, a little better than last time. Keep in mind this thang is heavy (3590lbs) Finally 14s!!!!