MkI coolant temp guage with 2 prong ABA sensor

[jdbubb at verizon.net (Dan Bubb)]

The temp sensor are just variable resistors. So, there is no reason the ABA sensor won't work with your existing gauge.
The issue here is probably that sensors just have different resistance curves.
On Kirsten's 1.8T swap we simply added resistance in series with the sensor until the gauge read in the middle of the range when the engine was at normal operating temp.

 From: "C Boyko" <roccit_53@xxxxxxxxxxxxxxxxxxxxxxx>
To: <scirocco-l@xxxxxxxxxxxx>
Sent: Sunday, June 17, 2007 5:02 PM
Subject: MkI coolant temp guage with 2 prong ABA sensor
 
 
> Yeah, so at some point my laptop won't be riding shotgun 24/7, so I'll 
> lose
> my coolant gauge on Megatune. This is in my '79, ABA head, with MSnS.
> Anyway, the stock ABA coolant temp sensor is in the coolant manifold, and
> just isn't working to send info to the stock cluster guage properly. The
> stock sender was a one wire, and hooking up the ABA sender with one wire 
> to
> the gauge and the other to ground just pegs the gauge. How do I know what
> the expected output is from the stock sender, and how do I adjust what's
> coming from this ABA one? I don't think that the stock one could be easily
> adapted, as it probably grounds in the manifold, and the ABA one is
> plastic, not metal. I don't have an ABA Bentley to see how it's normally
> wired up. Thanks!
> Cathy
>
>
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