diff --git a/firmware/integration/rusefi_config.txt b/firmware/integration/rusefi_config.txt
index 5549f4d3b9..97eb9a257a 100644
--- a/firmware/integration/rusefi_config.txt
+++ b/firmware/integration/rusefi_config.txt
@@ -1035,7 +1035,7 @@ bit unusedBitHere1
 bit useFSIO5ForCriticalIssueEngineStop;Sometimes we just have to shut the engine down. Use carefully!
 bit useFSIO4ForSeriousEngineWarning;Sometimes we have to miss injection on purpose to attract driver's attention
 bit unusedBitHere2
-bit unusedBitHere3
+bit twoStroke,"Two Stroke","Four Stroke"
 bit skippedWheelOnCam,"On camshaft","On crankshaft";+Where is your primary skipped wheel located?
 
 	adc_channel_e hipOutputChannel;
diff --git a/firmware/tunerstudio/rusefi.input b/firmware/tunerstudio/rusefi.input
index 6062fe2c77..a6f904f1ff 100644
--- a/firmware/tunerstudio/rusefi.input
+++ b/firmware/tunerstudio/rusefi.input
@@ -1907,7 +1907,8 @@ cmd_set_engine_type_default					= "@@TS_IO_TEST_COMMAND_char@@\x00\x31\x00\x00"
 
 		; see also in firmware '[doesTriggerImplyOperationMode]' tag
 		field = "Operation mode / speed",				ambiguousOperationMode
-		field = "Skipped wheel location",               skippedWheelOnCam
+		field = "What kind of engine",                  twoStroke
+		field = "Skipped wheel location",               skippedWheelOnCam, { twoStroke == 0 }
 		field = "#Please use '4 stroke with cam' only if primary trigger sensor is actually on cam"
 		field = "#Separate cam input not part of Trigger Pattern does not count here"
 		field = "With VR sensors only rising edge has reliable position"