VDO also has better senders
Is there a Kavlico option with A GRT EIS?
The VDO not only has grounding issues, they wear unpredictably at the normal cruise point as the wiper wears the resistor- yielding false high.
The only option on senders is the GRT P/N HS-SS-01 fuel pressure sender for fuel injected engines. Perhaps it's a Kavlico unit??? It sure is pricey, at $156. It also differs from the VDO senders in that it's stainless steel and has 4 wires, rather than 1. The VDO 1 wire senders can be purchases from GRT for $50. The VDO 1 and 2 wire senders are also available for less on Amazon and Jegs Performance [oil temp].
Do you have part numbers for Kavlico sender equivalents? The VDO pressure senders are 10 - 180 ohm units. I have a 20+ year old RMI uMonitor which uses VDO two terminal senders. The original oil pressure sender still works and is accurate. FYI, the uMonitor uses the same 10 - 180 ohm VDO senders, but with two terminals. The second terminal is used to ground the sender. Best methods would be to connect the sender grounds to the "forest of tabs" advocated in the AeroElectric Connection, or directly to the EIS. The two terminal senders are on average about $5 more than the single terminal [ground connection through the sender body] units supplied by GRT.
Below is a list of the VDO part numbers for the single terminal VDO senders supplied by GRT and VDO's two terminal equivalents. VDO recommends using 2 wire senders. The concern is that any sealant used on a 1 wire sender will impair the ground connection. The ground connection will also be affected by the multiple physical connections between the sender and the EIS.
Oil Pressure Transducer 10 bar 1wire VDO P/N 360-004 10 to 180 ohm
Oil Pressure Transducer 10 bar 2 wire VDO P/N 360-430 10 to 180 ohm
I don't know the VDO part number for the 1 wire fuel pressure sender. Below is the info for it's 2 wire equivalent. This is the low pressure sender used for carburetor engines.
Fuel Pressure Transducer 2 bar 2 wire VDO [Carb] P/N 360-043 10 to 180 ohm
OIl & Fuel Pressure Transducer 5 bar 1 wire VDO [FI] P/N 360-003 10 to 180 ohm
Oil & Fuel Pressure Transducer 5 bar 2 wire VDO [FI] P/N 360-410 10 to 180 ohm
All these senders have a 1/8" NPT fitting.
GRT uses both 5 bar [80 PSI] and 10 bar [150 PSI] oil pressure sending units, depending on the EIS's software version.
Download the GRT Troubleshooting guide for the EIS. Read pages 9 -11 regarding the oil pressure. Available at
http://grtavionics.com/media/Troubleshooting-Guide.pdf
Regarding your own problems with the VDO senders, where are/were your senders mounted? False high readings are due to open circuit or poor connections. Bad connection at the wiper would be one of several places that can happen on a 1 wire unit.
Charlie