My Corvette Journey - Troubleshooting the oil temperature analog gauge on a Corvette C4

[@scottsoltani8389]

The temp gauge on my 1993 is way past 260 is it similar?

[@Subi_88]

I recently picked up a 93 LT1 where the analog Oil Temp Gauge still "works" but shows way too low temperatures compared to the digital (and plausible) readings. Where should I start here? Replace the sensor or are there other possible error sources? Any input appreciated. Much love from germany!

[@yeller95vette]

The problem with the oil temperature sensor is there’s not an off the shelf replacement. How far off is it from your digital indication?

[@Ron-snakesinthegarage]

Hey great info. I'm trying to find out why my oil temp gauge is pegged. It was replaced with an aftermarket one when the mech broke the connector. I was going to do exactly what you did. Did you get an ohm reading that you can share?

[@yeller95vette]

None of the aftermarket temperature sensors will work. I tried them all, you have to find an original.

[@johnmontauti7027]

X2…. Care to share the range of ohms? The FSM leaves out a temp/ohm chart for the analog gauge. The aftermarket senders peg out on the analog. Trying to find a solution.

[@yeller95vette]

I tried a bunch of different aftermarket ones, and really the only thing it works is finding an original. This was from my Facebook post on the subject Lesson Learned I bought an oil temp sensor from rock auto it was a “standard motor products” brand, however, when I put it in my gauge would start from the bottom mark then suddenly jump to nearly 300°, then slowly creep up as the engine warmed up to the 325. Meanwhile, the digital part was reading correctly. I checked all the wiring, so I thought maybe there was something wrong with the sensor. So I bought one from Corvette Central and I’ll be damned if it also wasn’t the same standard motor products brand for $30 more, and has done the same thing. So then it got me wondering if there was something wrong with the circuit, feeding the analog gauge, the service manual tells you what the 325 mark it should have 26 ohms I bought a 2K ohm variable resistor and wired it in at the sensor plug by the engine and ran the rheostat up and down, and the gauge moves smoothly and at 325 it was 24 ohms. So there’s nothing wrong with the actual circuit. The trick I guess is to find someone who manufactures the correct sensor. I’m not sure if I wanna keep trying to buy a new one since there an electronic item there’s no returning them, I’m already at $150 wasted. I will just go buy a used one.

[@johnmontauti7027]

@@yeller95vette thank you for the reply and additional insight

[@paullemon6542]

What kind of video is that? You don’t show anything helpful on figuring out what the problem is